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350 twin (new)

Oil Leak Between head and Cylinder
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Pat Horvath

Joined:
2009-05-28 04:42:14

Posts: 1

Posted:Thursday 28 May, 2009 4:52 AM

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Subject: Oil Leak Between head and Cylinder

I put my engine back together and I now have an oil leak between the head and cylinder. The oil leak is on the left side of the bike.

I used all new gaskets when I put it back together and torqued to factory specs (14ft-lbs if I recall correctly). My gasket kit did not include orings for around the front locating dowels, and I am thinking this is where it is leaking from. I know that those stud holes (front left outter and front right outter) are used as an oil passage as well. I did a compression test and pulled ~172psi on each cylinder, I am confident that the gasket was not leaking around the cylinder.

Are there o-rings that go around the locating dowels on the front outter two? Should I put orings there so that I may prevent a leak? Should I put a gasket compound there instead of o-rings?

It may depend on how large the holes are on my new gasket, but figured I would ask. I do not know how large they are yet in relation the locating dowels.
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tom costello

Joined:
2009-01-09 02:06:51

Posts: 25

Posted:Saturday 30 May, 2009 3:46 PM

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Subject: Re: Oil Leak Between head and Cylinder

Hi Pat,
The torque spec. that you used for the cyl. head is correct but on the 350 twins the oil flows up the rear outside studs to the cyl. head. Honda did not use o-rings on the head gasket on this engine and recommended that new gaskets be put on dry with no sealer. If you have to use a sealer I have had good results with Copper Coat gasket sealer. When using it make sure you let the sealer dry before installing the gasket. You want to pin point exactly were the oil leak is originating from in order to help determine what needs to be done. Try retorquing the head. Loosen all the head nuts then torque in two stages,first at half torque then at full torque starting from the inside nuts to the outside in a crisscross pattern, also make sure the upper engine mount bolt is loose while doing this. I hope this helps.
Happy Trails. emoticon
Tom
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Chuck Beyea

Joined:
2009-08-29 22:20:27

Posts: 1

Posted:Saturday 29 August, 2009 10:28 PM

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Subject: Re: Oil Leak Between head and Cylinder

Thanks Tom, am in process of re-assembling 1971 SL350 that was given to me (engine was rebuilt, but not assembled). The manual says use o-rings, but none with it - just tried generic ones and looks to me like there is no way this will torque down properly. Am going to follow your advice and go without them.
Thanks again
Chuck
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