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Author Topic: Leaking engine at #2 -CB750K4  (Read 1201 times)

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Offline andy750

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Leaking engine at #2 -CB750K4
« on: April 16, 2006, 03:23:48 PM »
Hi all,
I replaced the headgasket last Fall as well as the valve oil seals and then ran the bike - still leaked very badly from #2 - see photo for site of leaking (as determined in a previous post). Today I pulled the engine again and opened up the valve cover....now the headgasket looks ok to me -see photo. But one thing thats different and it may or not matter but the 2 bolts (circles) havent different amounts of thread showing....perhaps tightened differently.....but would this make it leak at the place indicated! I dont know what these bolts do or if they have washers or what.....or where the oil is coming from! Anyone have any good ideas!? Thanks in advance!

Cheers
Andy
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Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

WHALEMAN

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Re: Leaking engine at #2 -CB750K4
« Reply #1 on: April 16, 2006, 04:04:03 PM »
it looks to me like what is leaking is the round rubber gaskets under the cam towers. If you go to one of the online stores that has parts pictures it is gasket #91318-300-013.
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Offline Terry in Australia

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Re: Leaking engine at #2 -CB750K4
« Reply #2 on: April 16, 2006, 05:05:06 PM »
Agreed, it'll most likely be the round rubber seals under the cam towers, if they aren't doing their job they'll allow oil to leak down between the cylinders exhaust ports and along the fins, quite common on our bikes.

Because they're under the cam towers, most people ignore them and replace the head and cam cover gaskets only. make sure you use a little sealant around their edges to ensure an oil tight seal. Cheers, Terry. ;D
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So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

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Offline andy750

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Re: Leaking engine at #2 -CB750K4
« Reply #3 on: April 16, 2006, 05:27:04 PM »
Ah thanks guys that would make sense. I couldnt really see that before but this is a good suggestion.....I dont recall changing those seals before (Ill need to check if htey are in the Veskrah kit but probobaly best to order them.... What type of sealant would you recommend Terry? I have hylomar....is this ok to use?

Many thanks!
Andy in Boston
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Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline Terry in Australia

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Re: Leaking engine at #2 -CB750K4
« Reply #4 on: April 17, 2006, 01:56:20 PM »
G'Day Andy, yeah mate, Hylomar's good, also Threebond, and probably all the other "bonds" (Hondabond, Yamabond etc) too, although I haven't tried them. Cheers, Terry. ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline andy750

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Re: Leaking engine at #2 -CB750K4
« Reply #5 on: April 17, 2006, 02:44:31 PM »
G`day Terry! Cheers thats all I need to know...I owe you a VB :)

Cheers
Andy
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Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline Terry in Australia

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Re: Leaking engine at #2 -CB750K4
« Reply #6 on: April 19, 2006, 03:39:11 AM »
Quote from: andy750 on April 17, 2006, 02:44:31 PM
G`day Terry! Cheers thats all I need to know...I owe you a VB :)

Cheers
Andy


No worries mate!  ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)
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