Water in Oil

[seahorse5]

Re: Water in Oil

Usually the riser, gasket, or manifold is the likely culprit, but do not overlook the dripping of water through the gap in the motor cover onto the carburetor flame arrestor and migrating into the intake manifold. From there it can enter a cylinder and "squeeze" past the piston and rings and end up in the oil.

 

[Walt T]

Re: Water in Oil

That would go away after an oil change tho.

 

[Trent]

Re: Water in Oil

Walter.....go back home!

 

[Walt T]

Re: Water in Oil

Edited.<br /><br />Take your differences outside please.<br /><br />Moderator1.

 

[moderator1]

Re: Water in Oil

DieselWalt, Your opinions are truly appreciated here, along with Trents. Both of you are considered as experts.<br /><br />Please refrain from flaming. Thanks.

 

[seahorse5]

Re: Water in Oil

Most of the time, when there is water mixed in the crankcase oil, it takes 2 or 3 oil changes to clean out any residual water emulsion and discoloration of the oil.

 

[Walt T]

Re: Water in Oil

Sorry Moderator. <br />Trent and I go way back. No harm done. <br />In reply to Seahorses comment, that may be true, but usually if the engine is allowed to get to operating temperature the water will boil out and be gone after one run.

 

[newDIYer]

Re: Water in Oil

I took the manifold off and connected my garden hose to the intake. I did not notice any water collecting in the intake or exhaust ports of the manifold. Is this an acceptable way to test? Or do I need more pressure? Or higher temperature?<br /><br />When I removed the manifold I did notice some liquid in the exhaust part of the manifold (about two thimbles full). Was this maybe condesation? Or leak only happens under higher temperature?

 

[DJ]

Re: Water in Oil

newDIYer,<br /><br />If your manifold is original, or more than four years old, it owes you nothing.<br /><br />I agree with some of the others, that's your leak source. Replace the riser too.

 

[newDIYer]

Re: Water in Oil

I think the manifold is original 1972. It still had the Mercrusier serial number label attached to the front. The manifold had two numbers stamped on it. The first number was in a raised rectangle area 071272 (I would guess serial number? July 12 1972? Is this correct?). The second number was in raised typeset 52390 (I would guess part number?). Riser also had two numbers stamped on it 062972 (June 29,1972?) and 60426 (part number?) I guess 31 years was a good run for a manifold.<br /><br />Just dropped it off to be pressure tested. Will know the results tomorrow.<br /><br />Is an Osco manifold a good replacement? Or should I go with original Mercruiser?<br /><br />Thanks for all the advice!

 

[crazy charlie]

Re: Water in Oil

Sounds like you are on the right track.Charlie

 

[jw454]

Re: Water in Oil

Hello there, SO MUCH discussion on your subject I may as well jump in. Your manifold probably is shot even if it is not the cause. But, I have had the same problem and went staight to the head gasket. (2 times). Both times (on different 140s) I had a break between the water jacket and the oil gally. While Iwas at it I sent the head to be resurfaced, boiled, and valve- and sping job. This really freshened the engines power (since the valves and especially the spings take the biggest beating in the engine). It was relativly cheap(about 300.00) for parts and machine labor, and the head is a snap to pull and replace. also the engines ran much cooler after boiling out the scale-rust that Iam sure your exhaust manifold is packed with. Good luck, Hope I can get all you guys on some of my questions