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Author Topic:   Would the wrong Part effect Performance?
BillD posted 10-30-2003 03:02 PM ET (US)   Profile for BillD   Send Email to BillD  
Not sure if this is a repair or performance question but I put it here in performance.

My boat (2000 Outrage 18 with an Optimax 150) is in for its winterization and annual once over by the Mercury dealer. This is the second season I have had the boat. Last year they did a basic service and this year I had them do a more involved service including plugs, impeller etc. During the service they noticed that a "restrictor" that attaches near the ECM was from a 135hp Optimax instead of the 150hp Optimax. It turns out the ECM was replaced under warranty in 2001 and they must have put the wrong "restrictor" on. Restrictor is the description the mechanic gave the part, Mercury calls the part a "Grommet" (Part #855613).

My question is: How would having the wrong part have effected engine performance if at all?

Sal DiMercurio posted 10-30-2003 10:12 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
A grommet is a restrictor or bushing, used to restrict the flow of water or fuel or to protect the outer case of something soft that has something moving through the hole in the grommet.
Now that i'v totally screwed up your head, it is most likely in the water system.
BillD posted 10-31-2003 11:03 AM ET (US)     Profile for BillD  Send Email to BillD     
It is definitely in the air or fuel system (I think it is in the air).

I was having trouble hitting max rpms all year even with a light load. If the air intake was restricted more than it should have been would this reduce performance (ability to hit max rpms).

I'll ask the mechanic tomorrow when I pick up the boat.


Sal DiMercurio posted 10-31-2003 09:13 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Bill, I know of no outboard that restricts the air flow.
or fuel flow.
BillD posted 11-03-2003 09:46 AM ET (US)     Profile for BillD  Send Email to BillD     

Apparently it is part of the Air handler. Apparently this $10 part that sits on top of the $2,100 Air Handler Assembly can make the Air Handler assembly work incorrectly. According to my mechanic the engine will run differently now because it was set up as a 135 hp instead of a 150 hp. He even indicated that I may have to re prop the engine as a result of the change in performance. I have had trouble propping the boat for the past 2 years with the "theoretically correct props" based on HP, weight, etc. not performing well. Hopefully they will work fine now.

I am still not exactly sure what the part does but you can see a picture of it at:

type 0t100873 in the serial number box and hit continue

Give it a zip code and select a dealer it does not matter who you select)

Or try this link (does not always work):

When you get the Parts and Accessory Category selection screen select "Air Handler"

The part number is 25-855613 and is listed as item 6.

Still do not really know what it does and I will not get to see the improved performance until the spring.

Bigshot posted 11-03-2003 10:54 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Why not replace it with the RIGHT part? Especially for $10.
BillD posted 11-03-2003 11:26 AM ET (US)     Profile for BillD  Send Email to BillD     
The parts for the 135HP and the 150 are apparently 1 digit off. The assumption is that when the repair was done in 2001 that they used the part for the 135 in error. The repair was done at a different dealer by a different owner. My dealer/mechanic noticed the error and fixed it. I am trying to figure out how much performance I was loosing by having the wrong part in for the past 2 years. Since according to the mechanic it will be enough to make me consider re propping I am guessing a few hundered RPMs is the answer. I was also hoping there may be a Mercury mechanic on this site that could tell me what it actually does.
Bigshot posted 11-03-2003 11:46 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
15hp aint much. If prop does not look like it was repitched then I doubt the former owner messed with it and it should work fine. What rpm were you hitting before?
kglinz posted 11-03-2003 01:15 PM ET (US)     Profile for kglinz  Send Email to kglinz     
Having checked the parts catalog, it appears that the Grommet comes as a open grommet used to seal the air intake (item 6) on the 150 HP or as a "restictor" (item 7) on the 135 HP. This is like the restictor plates used on Nascar cars to limit the HP, in an attempt to limit max speeds. It would have reduced your power, but there are probably other differences between the 135 and the 150, so you would not have lost the full 15 HP. It would be like running your car with a very dirty air filter. You won't know for sure until you run it.
bsmotril posted 11-03-2003 03:22 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
The restrictor and thr part number on it are easy to see on an opti. Pull off the top shroud, then lift off the belt guard/shroud that covers the top of the motor. Look down into the air intake hole of the intake plenum, the grommet is right there. Having the smaller 135 restrictor in place on a 150hp motor would certainly cause a loss of performance.
BillD posted 11-03-2003 03:22 PM ET (US)     Profile for BillD  Send Email to BillD     
It was the "restrictor" part because that is what the service tech actually called it even though it is officially called a grommet.

The prop is something I bought it is a 17" pitch and at times feels overproped, like I should have a 15" or 16" pitch on it. Practically everyone else I have spoken with that has the same boat motor combo is running a 17" fine. Hopefully in the spring (yes boating is over) the engine will turn the prop fine.

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