Crankshaft cap O-ring

hondaman160mph · Post by **hondaman160mph** » Sat Apr 04, 2015 2:18 pm

I removed the crankshaft cap to adjust my cam chain and found the previous owner had o-rings in all 3 holes. Why is an o-ring only needed
in the top hole?
Jeff

asacuta · Post by **asacuta** » Sat Apr 04, 2015 3:06 pm

It's the only one that threads into a pressurized oil gallery.

hondaman160mph · Post by **hondaman160mph** » Sat Apr 04, 2015 3:32 pm

ok,thanks Al.
Another dumb question, the crank cap gaskets I have are from CMSNL and have a line of black sealer on one side.Does that go towards the block or towards the cap?

daves79x · Post by **daves79x** » Sat Apr 04, 2015 4:13 pm

Towards the block - those are genuine Honda gaskets.

Dave

hondaman160mph · Post by **hondaman160mph** » Sat Apr 04, 2015 4:45 pm

Ok thanks Dave. The previous owner had them facing them other way, maybe that's why he had o-rings on all three screws to prevent oil from coming out the screw holes in the cap?

asacuta · Post by **asacuta** » Sat Apr 04, 2015 8:39 pm

daves79x wrote:Towards the block - those are genuine Honda gaskets.

Dave

How do we know the sealant faces the block? It's been so long since I've replaced the gasket, I forgot which way it goes. The sealant is long gone on the old gasket I keep reusing.

daves79x · Post by **daves79x** » Sat Apr 04, 2015 8:53 pm

The block has the crankcase split right in the middle of where the cover bolts on. Since the back of the cover is smooth with no seams, I assume the extra sealant goes toward the block.

Dave

asacuta · Post by **asacuta** » Sat Apr 04, 2015 9:25 pm

Sounds good to me.

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Crankshaft cap O-ring

Crankshaft cap O-ring

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