Author Topic: Crankcase Bolts  (Read 405 times)

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Offline Phoenix

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Crankcase Bolts
« on: October 02, 2022, 10:16:51 AM »
There are two paralllel lines of (5) #12 bolts on the bottom front end of the engine the secure the crank.  I had a guy that got into the bottom end and ever since I have been getting leakage from three of the bolts.  The bolts are tight.  I was able to get two of the leaks to stop by gunking them up with all sorts of stuff.  I have three questions:  What would all of a sudden cause them to leak.  How can they leak?  What is the best way to seal them?
Any help would really be appreciated.
Ed Spengeman
Indy
1971 CB750K1 (Stock)
1973 CB350 Twin  (Gone)

Offline PeWe

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Re: Crankcase Bolts
« Reply #1 on: October 02, 2022, 10:21:36 AM »
Which bike?
A CB750 crank halves sealed with Hondabond or similar.
Seal the towers around the bolt holes included. Each side of the bearings.
If not, oil will leak.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967