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81 GS750 oil leak

L

letchworth rider

Forum Apprentice
I have the infamous oil leak dripping over the center upside down cylinder head bolt. In an effort to do the repair to the top of the engine once, I did locate the leak starting point behind the #2 plug and running from the open fin area near the back of the motor.
The bike has not been on the road after a re-gasket job , so nothing to blow the oil around yet.

I ordered a cam cover gasket. I see the recommendation to get the O-rings (fiche #17 for 2) on the other posts.

What about the 6 head stud nut gaskets (fiche #13)?

I have eliminated the cam chain tensioner and tach drive, all dry, after cleaning leaking oil completely off the motor. Quite confident in the location.
 
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letchworth rider said:
I have the infamous oil leak dripping over the center upside down cylinder head bolt. In an effort to do the repair to the top of the engine once, I did locate the leak starting point behind the #2 plug and running from the open fin area near the back of the motor.
The bike has not been on the road after a re-gasket job , so nothing to blow the oil around yet.

I ordered a cam cover gasket. I see the recommendation to get the O-rings (fiche #17 for 2) on the other posts.

What about the 6 head stud nut gaskets (fiche #13)?

I have eliminated the cam chain tensioner and tach drive, all dry, after cleaning leaking oil completely off the motor. Quite confident in the location.
Click to expand...

The only leak I've ever had on my 750 was the tech drive. Once I installed a new seal and oring, all was fixed.
 
The cam cover oil leak is repaired with new gasket.
The leak is now at the center of the head, between the exhaust pipes, where the cam chain travels. Coming through the new head gasket (aftermarket).
Any way of sealing this without replacing the head gasket again? Is there a problem with the head in this area?
I have a knowledgeable shop nearby, states he sees a lot of these leak in this area.

Also, can the head gasket be replaced wit the motor in the frame?
 
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Finally tore down today. No cracks, the surfaces check flat within specs.The head gasket is still the first choice.The only other possibility would be the orings, which were replaced.
Have a NOS Suzuki head gasket. Surfaces cleaned up. Ready to go back together.
 
Head on and torqued.
Interesting observation, Suzuki head gasket had a sealer applied all around the cam chain area, top and bottom, aftermarket gasket did not.

Yes, use the Suzuki gasket.
 
letchworth rider said:
Head on and torqued.
Interesting observation, Suzuki head gasket had a sealer applied all around the cam chain area, top and bottom, aftermarket gasket did not.

Yes, use the Suzuki gasket.
Click to expand...


letchworth rider said:
Problem solved!
Click to expand...

Deffo OEM gaskets for the base and head. All the others are less critical and can be easily replaced, but it's a pita to rip it apart again when the base or head leaks.
 
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