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Author Topic:   90-HP Over Heat; Assessing Damage

JBG777 posted 11-19-2005 08:15 AM ET (US)
While winterizing my 90HP on my Montauk I ran the motor accidentaly(idiot)about 3 minutes with no water running through the motor. The warning light came on, at that point I realized I forgot to turn the hose on.
I ran water let the motor cool and started her up. She seemed to run fine. My question is how do I know if I did any motor damage?
JBG
tarbaby posted 11-19-2005 08:31 AM ET (US)
I would have the head retorqued and change the impeller. Then don't worry about it. It happens to the best of us. You probably did no damage. Don't beat yourself up.
Shay
JBG777 posted 11-19-2005 08:42 AM ET (US)
Can you take me through the process of changing the impeller and having the head retourqued? I"m not familiar of the process.
Chuck Tribolet posted 11-19-2005 09:27 AM ET (US)
Retorquing the head is just a matter of breaking each head bolt
loose, and then tightening it to the specified torque, one at
a time. There's a specific pattern to do it in on my Evinrude
90 and it's cast onto the heads. It's speced as part of the
100 hour service, BTW.

And you're probably OK. I've had the overheat alarm come on
a couple of times due to kelp wrapped around the intakes.
Nothing permanent.

Chuck
jimh posted 11-19-2005 09:37 AM ET (US)
If you purchase the factory service manual for your particular brand, model, year, and horsepower, it will have information on how to service the water pump impeller as well as information about the proper torque and sequence for the cylinder head bolts.
To torque the cylinder head bolts you will need:
--torque wrench
--torque specifications
--bolt sequence specifications
To replace the water pump impeller you will need:
--water pump repair kit (recommend OEM parts)
The water pump on outboard motors is almost universally located in the gear case. Here are brief instructions:
--remove propeller
--disconnect any shift linkages
--remove all fasteners holding gear case to mid-section
--remove gear case
--disassemble water pump
--install replacement impeller, seals, housing, gaskets, o-rings, etc.
--reassemble water pump
--re-install gear case onto mid-section, being sure to align various cooling water passages and hoses, exhaust gas passages, shift shaft, drive shaft, etc.
--re-install fasteners
--reconnect shift linkages
--test motor for proper operation
I recommend you take the engine to a good mechanic for this work. On a 90-HP engine it will probably cost about $150 or less for this procedure. Considering the cost of a new engine, this is a good investment.
Replacement of the water pump impeller is routinely done periodically, so this expense is not unusual in the general cost of maintaining an engine. The cost to check the cylinder head bolts will be minimum; it just takes a few minutes.
jimh posted 11-19-2005 09:42 AM ET (US)
Advice on repairs and modifications is usually provided in the REPAIRS/MODS area.
Clark Roberts posted 11-19-2005 12:12 PM ET (US)
If the engine is a 90hp Merc two stroker then there are no head bolts to retorque...but it wouldn't hurt to check the torque on the water jacket cover for the cyls. and the exhaust baffle... Clark... SCN
JBG777 posted 11-21-2005 07:09 AM ET (US)
Guys, Thank you!
I took the boat to the shop and they replaced the impeller and the gaskets. There was minimal damage, however it probably needed to be done anyway. The cost was around $130.
Lesson learned.............and thanks for the feedback.
PeteB88 posted 11-21-2005 11:05 PM ET (US)
You got it handled but it is best to learn how to use a torque wrench properly as well if anyone tries it.

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Author	Topic: 90-HP Over Heat; Assessing Damage
JBG777	posted 11-19-2005 08:15 AM ET (US) While winterizing my 90HP on my Montauk I ran the motor accidentaly(idiot)about 3 minutes with no water running through the motor. The warning light came on, at that point I realized I forgot to turn the hose on. I ran water let the motor cool and started her up. She seemed to run fine. My question is how do I know if I did any motor damage? JBG
tarbaby	posted 11-19-2005 08:31 AM ET (US) I would have the head retorqued and change the impeller. Then don't worry about it. It happens to the best of us. You probably did no damage. Don't beat yourself up. Shay
JBG777	posted 11-19-2005 08:42 AM ET (US) Can you take me through the process of changing the impeller and having the head retourqued? I"m not familiar of the process.
Chuck Tribolet	posted 11-19-2005 09:27 AM ET (US) Retorquing the head is just a matter of breaking each head bolt loose, and then tightening it to the specified torque, one at a time. There's a specific pattern to do it in on my Evinrude 90 and it's cast onto the heads. It's speced as part of the 100 hour service, BTW. And you're probably OK. I've had the overheat alarm come on a couple of times due to kelp wrapped around the intakes. Nothing permanent. Chuck
jimh	posted 11-19-2005 09:37 AM ET (US) If you purchase the factory service manual for your particular brand, model, year, and horsepower, it will have information on how to service the water pump impeller as well as information about the proper torque and sequence for the cylinder head bolts. To torque the cylinder head bolts you will need: --torque wrench --torque specifications --bolt sequence specifications To replace the water pump impeller you will need: --water pump repair kit (recommend OEM parts) The water pump on outboard motors is almost universally located in the gear case. Here are brief instructions: --remove propeller --disconnect any shift linkages --remove all fasteners holding gear case to mid-section --remove gear case --disassemble water pump --install replacement impeller, seals, housing, gaskets, o-rings, etc. --reassemble water pump --re-install gear case onto mid-section, being sure to align various cooling water passages and hoses, exhaust gas passages, shift shaft, drive shaft, etc. --re-install fasteners --reconnect shift linkages --test motor for proper operation I recommend you take the engine to a good mechanic for this work. On a 90-HP engine it will probably cost about $150 or less for this procedure. Considering the cost of a new engine, this is a good investment. Replacement of the water pump impeller is routinely done periodically, so this expense is not unusual in the general cost of maintaining an engine. The cost to check the cylinder head bolts will be minimum; it just takes a few minutes.
jimh	posted 11-19-2005 09:42 AM ET (US) Advice on repairs and modifications is usually provided in the REPAIRS/MODS area.
Clark Roberts	posted 11-19-2005 12:12 PM ET (US) If the engine is a 90hp Merc two stroker then there are no head bolts to retorque...but it wouldn't hurt to check the torque on the water jacket cover for the cyls. and the exhaust baffle... Clark... SCN
JBG777	posted 11-21-2005 07:09 AM ET (US) Guys, Thank you! I took the boat to the shop and they replaced the impeller and the gaskets. There was minimal damage, however it probably needed to be done anyway. The cost was around $130. Lesson learned.............and thanks for the feedback.
PeteB88	posted 11-21-2005 11:05 PM ET (US) You got it handled but it is best to learn how to use a torque wrench properly as well if anyone tries it.