Topic: Head gasket or cam tower pucks?

[fxef79]

Based on what I see here, I’m leaning towards head gasket. But I’m interested to hear other more experienced thoughts.


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[fxef79]

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[RAFster122s]

Pucks leak like that on 750...

[TwoTired]

Do a compression test if you suspect a head gasket.  But, if it checks good, I don't think it does much to keep in the oil. Pucks, o rings, seals, etc. contain the oil, AFAIK.  Of course, to change some of those the head must come off.

Cheers,

[newday777]

Based on what I see here, I’m leaning towards head gasket. But I’m interested to hear other more experienced thoughts.

Is this on a 750??? Ya gotta tell us what yer workn on when asking a question.

If it's a 750??? Yes the pucks are the usual cause of oil in the fins.

[fxef79]

Based on what I see here, I’m leaning towards head gasket. But I’m interested to hear other more experienced thoughts.

Is this on a 750??? Ya gotta tell us what yer workn on when asking a question.

If it's a 750??? Yes the pucks are the usual cause of oil in the fins.

Sorry about that. Yes it’s a 750 K8. (!!!!!!!!!!!!)

[fxef79]

Yes the pucks are the usual cause of oil in the fins.

I was questioning whether it was pucks only because wouldn’t I see the oil coming out on the top of the lowest fin of the head, then spilling over onto the cylinder fins below it?  What I see (at least on one side) is zero oil on the head fins.


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[Don R]

 There are areas inside the fins that let oil flow down to the cylinder top.
   I've had luck finding a leak on big block chevys just blowing into the vent hose and listen or spray some soapy water. On a cb750  you may need to plug the oil tank vent too. (Finger over the hose)
  The time I told my buddy at the track this he was sure I'd be making a video to embarrass him on  youtube. I had to walk away before he would try it but they did find the distributor gasket leaking vacuum which allowed the vacuum pump to suck oil.

[ekpent]

 If its the pucks for sure then the cam and cam towers would need to come out but the head can stay on. Fun part is the engine has to be out also unless you have a frame kit.

[fxef79]

If its the pucks for sure then the cam and cam towers would need to come out but the head can stay on. Fun part is the engine has to be out also unless you have a frame kit.

Plenty of room on this frame.


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[fxef79]

There are areas inside the fins that let oil flow down to the cylinder top.

Guess I’ll be pulling the cam and towers then.

[seanbarney41]

There are areas inside the fins that let oil flow down to the cylinder top.

Guess I’ll be pulling the cam and towers then.

while all that stuff is out of the way, I will do a cylinder head re-torque and have had good success making these things oil tight again.  Sometimes bikes that have been sitting a long time will leak or not intermittenly.  It usually takes 5 or 6 rides of full operating temp for them to decide which way they wanna go.

[jonda500]

Do a compression test if you suspect a head gasket.  But, if it checks good, I don't think it does much to keep in the oil. Pucks, o rings, seals, etc. contain the oil, AFAIK.  Of course, to change some of those the head must come off.

Cheers,

+1  couldn't have said it any better!
John