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Author Topic:   2008 MONTAUK 170 Engine Water Pressure

bben posted 11-14-2007 07:31 PM ET (US)
I have been having a lot of fun with the new [2008 MONTAUK 170] ride. I will post pictures as soon as we get home next week. I am not used to having a water pressure gauge and wanted to make sure my readings were good. I will say that the water doesn't seem to come out the back with the same force as my 150 Montuak did. At idle, the water pressure is only about 2-PSI; crusing at about 3,500 RPM it gets up to about 10-PSI. Wide open throttle gets to about 18- to 22-PSI. The idle pressure seems low, especially when combined with what looks like a lot less force coming out the back than my 60-HP 150 did. The pressure has been the same since the first turn of the key and I have run it for about 10 hours thus far. Do these presssures seem low or normal? I also noticed that after cruisng at wide open and then quickley backing it off to very low RPM will produce smoke out of the exhaust. This also never occurred with my 150. Any thoughts would be appreciated. Thank you.
Andrewdavis34 posted 11-14-2007 11:48 PM ET (US)
Ben,
I too have a new 2008 170 that I picked up October 10. I seem to recall that my water presure is similiar to yours. I am going to take it out this weekend and I will note idle, 3,500, and wide open pressure.
If your interested in purchasing a cover for your boat. I just purchased a Sunbrella cover with seperate motor cover from boatcoversdirect.com. They matched and beat America-Trade by 10.00 free shipping delivered to my door step for $350.00. Included was a free tie down kit. The cover is very well made and fits nicely for the price. If interested in will post some pics.
I be in touch after my outing this weekend.
Andrew
bben posted 11-15-2007 07:08 AM ET (US)
Thanks Andrew. I am taking it out again today and will post a few more readings for comparison. I think it should be fine but it just seemed low to me. I ended up getting the Mills cover (for a significnat amount more!). I wish I had waited - I did some research but without a specific experience for the new console height, I was worried the other covers would not fit right. I was wrong! You got a great deal. Thanks, again for the help on the water pressures. Ben
bigjohn1 posted 11-15-2007 07:45 AM ET (US)
Sounds about normal. I have very similar readings on an 2004 115 EFI.
Feejer posted 11-15-2007 08:35 AM ET (US)
Ben, your water pressure seems to be par what I am getting also
bben posted 11-15-2007 02:20 PM ET (US)
Thanks, Guys. Just had her out for a nice ride and took some readings. Idle is between 2 and 3-PSI, 1,000-RPM 4- to 5-PSI, 2,000-RPM 8-PSI, 3,000-RPM 9- to 10-PSI, 4,000-RPM 11- to 14-PSI, and 5,000 to 6,000-RPM between 16- and 22-PSI. I feel better based on all of your response. Thank you! It is interesting that the manual doesn have an information about the ranges. Any thoughts on the exhaust? I am thinking that maybe when I slowed, the water came up too high on the motor. Could than cause the smoke? Thanks again for all of the help. Ben
bluewaterpirate posted 11-15-2007 02:51 PM ET (US)
If your operating in cold water you will see some smoke caused by the differences in temperature of exhaust, air, and water especicailly at slow speeds. See it all the time when the water temperature gets below 60 degrees. I have my Whaler in 40 degree water and below freezing temps on occassion fishing.
swist posted 11-16-2007 08:10 AM ET (US)
I'm not sure if these water pressure gauge systems are sophisticated enough to actually give you anything close to the actual water pressure in the engine. But they should give repeatable readings, whatever the numbers are. So the important thing is to note what readings you have at various RPM and then monitor the gauge for change (typically a drop).
Feejer posted 11-16-2007 09:51 AM ET (US)
Ben, are you really seeing smoke or is it airborne condensation (steam)? I have seen this on my Yamaha F150 and on my Merc 90hp. In the fall and spring I see it a lot. If you come down from running fast the motor will naturally be hot, cooling water flows thru, heats the hotter parts and creates a little steam. Thats my guess at what your seeing. If it is smoke RUN to your nearest dealer
bben posted 11-16-2007 07:33 PM ET (US)
It really was exhaust smoke. It was a little blusih but not too bad. The motor does seem to run a bit rought at idle, with the cowl shaking slightly...
Feejer posted 11-16-2007 07:45 PM ET (US)
If it were my new boat I would not run it anymore and take it to a Whaler or Merc dealer ASAP. Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture
bben posted 11-16-2007 08:44 PM ET (US)
Feejer, it doesnt smoke all the time; I really only noticed it twice, both times after slowing from high speed. Combined with the rough idle, however, I am a little concerned. I have been checking the oil level and it hasnt changed and looks and smells ok.
Feejer posted 11-16-2007 10:04 PM ET (US)
Ben
I'm no mechanic but you should really have it looked at soon. It could be nothing or something very minor....then again.
Feejer posted 11-16-2007 10:06 PM ET (US)
Uh Oh, you screwed up the break in didn't you (kidding)
BlueMax posted 11-17-2007 12:31 AM ET (US)
AndrewDavis - Are you sure you got a Sunbrella cover and not a solution-dyed Polygaurd? I've got a 2007 Montauk and have been to boatcoversdirect a few times - the Sunbrella cover is always listed at $475 - Polyguard at $305 (so $350 with motor cover sounds right). I don't see any sales or anything listed (just went there again to find out) Also, what is the America-trade site? I did a google search (included words boat cover) but only get commodity trading hits...? Don't know (shrugging shoulders). Great Deal if it is the Sunbrella.
And...since this thread began with the question on water pressure. I get the same readings on my 90 hp Merc 4Stroke that came with the 2007 170 Montauk. Very small stream (and seemingly weak at low rpms) as compared to many other engines I've seen. I've never had the engine smoke though.
bben posted 11-17-2007 08:03 PM ET (US)
Thanks for the replies. Today is my last day down here and no smoke, but we did notice some black soot coming out the propeller exhaust (maybe out the top exhaust too, it was hard to tell) on a few warm start ups. It didnt occur on each start up and it was only at the intial start; trolling or idling produced nothing. The oil level is ok and doesnt seem to have chnaged at all; we have about 10-12 hours on the motor thus far and it performs well with the excpetion of a rough idle at times (again, not all the time). I think the black soot is normal on a 2 stroke but not on my 4 stroke...is that right? I plan to get it checked out in any event.
Feejer posted 11-18-2007 09:31 AM ET (US)
You should not have any soot at all, unless this is a diesel
Nauti Tauk posted 11-18-2007 09:21 PM ET (US)
Hey guys,
Just had yearly maint. done on our 2003 90hp/4stroke Merc. and can answer your water pressure questions. My mechanic told me that the newer Mercurys as well as most of the other manufacurers, have changed from high pressure/low volume to low pressure/high volume water pumps and cooling systems. This enables a couple of things to take place. Number one it extends the life of the waterpump impeller considerably,from 50-100hrs. to 200-300 hrs, and also improves heat transfer within the engine thus improving overall cooling. My engines water pressure guage readings are just about identical to everyone elses.
BlueMax posted 11-21-2007 08:40 AM ET (US)
I think I would have to agree with Bluewater on the possible cause of the smoke - Went out the past few days here in Bogue and Brown's inlet, NC, first time seeing any "smoke" on the water for me. White smoke (exhaust) while trolling - the water temps were 56-58 degrees. I'd worry a bit about Blue smoke though and have it investigated.

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Author	Topic: 2008 MONTAUK 170 Engine Water Pressure
bben	posted 11-14-2007 07:31 PM ET (US) I have been having a lot of fun with the new [2008 MONTAUK 170] ride. I will post pictures as soon as we get home next week. I am not used to having a water pressure gauge and wanted to make sure my readings were good. I will say that the water doesn't seem to come out the back with the same force as my 150 Montuak did. At idle, the water pressure is only about 2-PSI; crusing at about 3,500 RPM it gets up to about 10-PSI. Wide open throttle gets to about 18- to 22-PSI. The idle pressure seems low, especially when combined with what looks like a lot less force coming out the back than my 60-HP 150 did. The pressure has been the same since the first turn of the key and I have run it for about 10 hours thus far. Do these presssures seem low or normal? I also noticed that after cruisng at wide open and then quickley backing it off to very low RPM will produce smoke out of the exhaust. This also never occurred with my 150. Any thoughts would be appreciated. Thank you.
Andrewdavis34	posted 11-14-2007 11:48 PM ET (US) Ben, I too have a new 2008 170 that I picked up October 10. I seem to recall that my water presure is similiar to yours. I am going to take it out this weekend and I will note idle, 3,500, and wide open pressure. If your interested in purchasing a cover for your boat. I just purchased a Sunbrella cover with seperate motor cover from boatcoversdirect.com. They matched and beat America-Trade by 10.00 free shipping delivered to my door step for $350.00. Included was a free tie down kit. The cover is very well made and fits nicely for the price. If interested in will post some pics. I be in touch after my outing this weekend. Andrew
bben	posted 11-15-2007 07:08 AM ET (US) Thanks Andrew. I am taking it out again today and will post a few more readings for comparison. I think it should be fine but it just seemed low to me. I ended up getting the Mills cover (for a significnat amount more!). I wish I had waited - I did some research but without a specific experience for the new console height, I was worried the other covers would not fit right. I was wrong! You got a great deal. Thanks, again for the help on the water pressures. Ben
bigjohn1	posted 11-15-2007 07:45 AM ET (US) Sounds about normal. I have very similar readings on an 2004 115 EFI.
Feejer	posted 11-15-2007 08:35 AM ET (US) Ben, your water pressure seems to be par what I am getting also
bben	posted 11-15-2007 02:20 PM ET (US) Thanks, Guys. Just had her out for a nice ride and took some readings. Idle is between 2 and 3-PSI, 1,000-RPM 4- to 5-PSI, 2,000-RPM 8-PSI, 3,000-RPM 9- to 10-PSI, 4,000-RPM 11- to 14-PSI, and 5,000 to 6,000-RPM between 16- and 22-PSI. I feel better based on all of your response. Thank you! It is interesting that the manual doesn have an information about the ranges. Any thoughts on the exhaust? I am thinking that maybe when I slowed, the water came up too high on the motor. Could than cause the smoke? Thanks again for all of the help. Ben
bluewaterpirate	posted 11-15-2007 02:51 PM ET (US) If your operating in cold water you will see some smoke caused by the differences in temperature of exhaust, air, and water especicailly at slow speeds. See it all the time when the water temperature gets below 60 degrees. I have my Whaler in 40 degree water and below freezing temps on occassion fishing.
swist	posted 11-16-2007 08:10 AM ET (US) I'm not sure if these water pressure gauge systems are sophisticated enough to actually give you anything close to the actual water pressure in the engine. But they should give repeatable readings, whatever the numbers are. So the important thing is to note what readings you have at various RPM and then monitor the gauge for change (typically a drop).
Feejer	posted 11-16-2007 09:51 AM ET (US) Ben, are you really seeing smoke or is it airborne condensation (steam)? I have seen this on my Yamaha F150 and on my Merc 90hp. In the fall and spring I see it a lot. If you come down from running fast the motor will naturally be hot, cooling water flows thru, heats the hotter parts and creates a little steam. Thats my guess at what your seeing. If it is smoke RUN to your nearest dealer
bben	posted 11-16-2007 07:33 PM ET (US) It really was exhaust smoke. It was a little blusih but not too bad. The motor does seem to run a bit rought at idle, with the cowl shaking slightly...
Feejer	posted 11-16-2007 07:45 PM ET (US) If it were my new boat I would not run it anymore and take it to a Whaler or Merc dealer ASAP. Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture
bben	posted 11-16-2007 08:44 PM ET (US) Feejer, it doesnt smoke all the time; I really only noticed it twice, both times after slowing from high speed. Combined with the rough idle, however, I am a little concerned. I have been checking the oil level and it hasnt changed and looks and smells ok.
Feejer	posted 11-16-2007 10:04 PM ET (US) Ben I'm no mechanic but you should really have it looked at soon. It could be nothing or something very minor....then again.
Feejer	posted 11-16-2007 10:06 PM ET (US) Uh Oh, you screwed up the break in didn't you (kidding)
BlueMax	posted 11-17-2007 12:31 AM ET (US) AndrewDavis - Are you sure you got a Sunbrella cover and not a solution-dyed Polygaurd? I've got a 2007 Montauk and have been to boatcoversdirect a few times - the Sunbrella cover is always listed at $475 - Polyguard at $305 (so $350 with motor cover sounds right). I don't see any sales or anything listed (just went there again to find out) Also, what is the America-trade site? I did a google search (included words boat cover) but only get commodity trading hits...? Don't know (shrugging shoulders). Great Deal if it is the Sunbrella. And...since this thread began with the question on water pressure. I get the same readings on my 90 hp Merc 4Stroke that came with the 2007 170 Montauk. Very small stream (and seemingly weak at low rpms) as compared to many other engines I've seen. I've never had the engine smoke though.
bben	posted 11-17-2007 08:03 PM ET (US) Thanks for the replies. Today is my last day down here and no smoke, but we did notice some black soot coming out the propeller exhaust (maybe out the top exhaust too, it was hard to tell) on a few warm start ups. It didnt occur on each start up and it was only at the intial start; trolling or idling produced nothing. The oil level is ok and doesnt seem to have chnaged at all; we have about 10-12 hours on the motor thus far and it performs well with the excpetion of a rough idle at times (again, not all the time). I think the black soot is normal on a 2 stroke but not on my 4 stroke...is that right? I plan to get it checked out in any event.
Feejer	posted 11-18-2007 09:31 AM ET (US) You should not have any soot at all, unless this is a diesel
Nauti Tauk	posted 11-18-2007 09:21 PM ET (US) Hey guys, Just had yearly maint. done on our 2003 90hp/4stroke Merc. and can answer your water pressure questions. My mechanic told me that the newer Mercurys as well as most of the other manufacurers, have changed from high pressure/low volume to low pressure/high volume water pumps and cooling systems. This enables a couple of things to take place. Number one it extends the life of the waterpump impeller considerably,from 50-100hrs. to 200-300 hrs, and also improves heat transfer within the engine thus improving overall cooling. My engines water pressure guage readings are just about identical to everyone elses.
BlueMax	posted 11-21-2007 08:40 AM ET (US) I think I would have to agree with Bluewater on the possible cause of the smoke - Went out the past few days here in Bogue and Brown's inlet, NC, first time seeing any "smoke" on the water for me. White smoke (exhaust) while trolling - the water temps were 56-58 degrees. I'd worry a bit about Blue smoke though and have it investigated.