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1978 CB 750 F2 - Oil pouring from above head gasket

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SteveD CB500K0:
Anyone care to explain what an MLS gasket is for those of us who haven’t a clue?


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Trigger:

--- Quote from: SteveD CB500K0 on May 10, 2020, 08:46:24 AM ---Anyone care to explain what an MLS gasket is for those of us who haven’t a clue?


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--- End quote ---

Multi layer is a number of steel plated gasket with a sealer between the plates. Some have rivets to keep the plates together and are not suitable for some heads unless, you start machining recesses out for the rivets to sit in.

Trigger:

--- Quote from: stoutgoose on May 10, 2020, 08:10:10 AM ---I used HT Howard in Slough who use equipment that detects the metal type and adjusts the cut accordingly; in this case it accounted for the alloy head and steel liners without the need to remove the liners and the associated work you mention. The cut is excellent.

The original oval fire-ring gasket for the F2 is obsolete from Honda; do Vesrah make the oval type? Anyhow, the cost of the skim was reasonable and with the reduced leak potential promised by the MLS gasket I thought it a good idea, but time will tell.

Thanks for the information.

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Honda 410 head gaskets are ready available  ;)

stoutgoose:
Update to close the thread. I removed the engine and stripped the valve gear to take a look at the studs. I located the copper sealing washers which weren't in the correct place (my manual made no mention of sealing washers and cap nuts). I removed the Kibblewhite nuts on studs 5-8, annealed the sealing washers and put them on studs 5-8 along with the correct cap nuts, and reassembled the bike.

Problem solved. The engine is now leak-free. It is rather surprising just how much oil can find its way down a stud thread and under a standard steel washer.

I'm now off to burn my 'Honda' manual and the Haynes version, and locate a real one. Many thanks for all your replies.

K2-K6:
Good news you've sorted the problem.

The Honda manual I posted picture from (it's not mine but belongs to an F2 owner) has a part # 6141000

Just searched with "Honda 6141000" and quite a few come up for sale. It is their genuine manual for the last of sohc 750 it seems, pretty comprehensive for specs etc too.

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