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Author Topic: Valve cover leaking from bolt.  (Read 593 times)

Offline mada1594

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Valve cover leaking from bolt.
« on: Aug 22, 2017, 19:51:08 »
Hi guys I am new to motorcycles and working on them. I just got my first bike it is a 1975 cb200t. I am having a problem with oil leaking from the bolts in the valve cover.

I realized there were no crush washers so I put those on there and it helped stop the leak from all the bolts except one. The bolt on the right back closest to you is still leaking from the top of the bolt. Now I did notice that the nuts on the left side when tightened go further down the bolts than the ones on the right. The nuts on the right side when tightened barely sit flush with the bolt.

The leak is not coming from the gasket it is seeping out from the top of the bolt. Like I said I am new to this so please help with any tips and ideas on how to fix this thanks!


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Offline VonYinzer

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Re: Valve cover leaking from bolt.
« Reply #1 on: Aug 22, 2017, 20:36:25 »
Pull the valve cover, ensure the gasket is ok and re-torque the cover back down according to factory specs.
Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'

Offline Tim

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Re: Valve cover leaking from bolt.
« Reply #2 on: Aug 22, 2017, 20:38:20 »
There may be a locating dowel missing.  Typically valve cover bolts don't need to seal - they pass through sections of the cover that are surrounded by mating surfaces.  One might not be, but should perhaps pass through a locating dowel.

Parts diagram?  Always start with the manuals.
"Quality . . . you know what it is, yet you don't know what it is. But that's self-contradictory. But some things are better than others, that is, they have more quality. But when you try to say what the quality is, apart from the things that have it, it all goes poof! There's nothing to talk about. But if you can't say what Quality is, how do you know what it is, or how do you know that it even exists? If no one knows what it is, then for all practical purposes it doesn't exist at all. But for all practical purposes it really does exist."

Offline VonYinzer

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Re: Valve cover leaking from bolt.
« Reply #3 on: Aug 22, 2017, 20:47:22 »
There may be a locating dowel missing.  Typically valve cover bolts don't need to seal - they pass through sections of the cover that are surrounded by mating surfaces.  One might not be, but should perhaps pass through a locating dowel.

Parts diagram?  Always start with the manuals.

That ^^^

Pics may help as well
Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'

Offline mada1594

  • Posts: 13
Re: Valve cover leaking from bolt.
« Reply #4 on: Aug 23, 2017, 02:12:16 »
Ok thanks for the tips I will try that! Also I realized that the previous owner installed regular nuts on it and not "cap nuts" that originally came on the bike could this also be the reason the oil is running up through the bolt threads and seeping out the top between the bolt and nut?


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Offline Tim

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Re: Valve cover leaking from bolt.
« Reply #5 on: Aug 23, 2017, 08:44:54 »
Looks like we found the manual a bit ago (uploaded 2011).  It's 17MB in size and is the original Honda Service Manual.

www.dotheton.com/downloads/Honda_CB200_CL200_Manual.pdf
"Quality . . . you know what it is, yet you don't know what it is. But that's self-contradictory. But some things are better than others, that is, they have more quality. But when you try to say what the quality is, apart from the things that have it, it all goes poof! There's nothing to talk about. But if you can't say what Quality is, how do you know what it is, or how do you know that it even exists? If no one knows what it is, then for all practical purposes it doesn't exist at all. But for all practical purposes it really does exist."

Offline teazer

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Re: Valve cover leaking from bolt.
« Reply #6 on: Aug 23, 2017, 10:57:22 »
Oil feed to the top end goes up around the rear outer studs.  Cap nuts (dome nuts) and crush washers are essential.

Offline Tim

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Re: Valve cover leaking from bolt.
« Reply #7 on: Aug 23, 2017, 11:10:59 »
No mention of washers in the manual.  Just 'cap nuts' torqued to 13-16 lb ft.  They include the bolt in the tightening pattern as #9 but I wouldn't go past 6-7 lb ft on it.  I'm guessing it's a 6mm bolt threaded into aluminum.  The nuts go on studs so the higher torque is fine.

Cap nuts and some copper washers for good measure should seal it up.
"Quality . . . you know what it is, yet you don't know what it is. But that's self-contradictory. But some things are better than others, that is, they have more quality. But when you try to say what the quality is, apart from the things that have it, it all goes poof! There's nothing to talk about. But if you can't say what Quality is, how do you know what it is, or how do you know that it even exists? If no one knows what it is, then for all practical purposes it doesn't exist at all. But for all practical purposes it really does exist."

Offline mada1594

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Re: Valve cover leaking from bolt.
« Reply #8 on: Aug 23, 2017, 11:46:48 »
Ok great thanks for the help guys! Ordered the cap nuts and some more crush washers to try this again I will update in a few days if the problem was solved.


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Offline mada1594

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Re: Valve cover leaking from bolt.
« Reply #9 on: Aug 23, 2017, 11:53:33 »
Also I don't have a torque wrench that shows lbs of pressure is there any way to do it without one or do I need to buy one bc idk what 16 lbs ft Feels like.


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Offline VonYinzer

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Re: Valve cover leaking from bolt.
« Reply #10 on: Aug 23, 2017, 12:11:42 »
Also I don't have a torque wrench that shows lbs of pressure is there any way to do it without one or do I need to buy one bc idk what 16 lbs ft Feels like.


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16 ft/lb = 21 nm or 192 in/lb
Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'

Re: Valve cover leaking from bolt.
« Reply #11 on: Aug 23, 2017, 13:36:52 »
Also I don't have a torque wrench that shows lbs of pressure is there any way to do it without one or do I need to buy one bc idk what 16 lbs ft Feels like.

Get a decent torque wrench, you'll need it and there is nothing like overtightening a bolt and stripping threads or breaking stuff that will make you wish you did. Some stuff like rocker adjuster covers is pretty easy -- they don't need to be tightened down that much, and if they weep you can tighten just a bit more or replace the o-ring, but for some stuff you're going to want to know you've done it right.
"Remember when Goldwings were sexy? Me neither" -- Comet Tavern bathroom, Seattle.

Offline mada1594

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Re: Valve cover leaking from bolt.
« Reply #12 on: Aug 26, 2017, 00:41:01 »
Hey guys another question. I will be getting the crush washers this Monday in the mail. Should I put those on with just the cap nuts or should I put a stainless washer on top of the crush washer?


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Offline J-Rod10

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Re: Valve cover leaking from bolt.
« Reply #13 on: Aug 26, 2017, 10:51:45 »
There may be a locating dowel missing.  Typically valve cover bolts don't need to seal - they pass through sections of the cover that are surrounded by mating surfaces.  One might not be, but should perhaps pass through a locating dowel.

Parts diagram?  Always start with the manuals.
Not true, in all cases. My 750 DOHC has bolts with tapered rubber on them to seal off. If not torqued properly, oil comes out.

Offline teazer

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Re: Valve cover leaking from bolt.
« Reply #14 on: Aug 26, 2017, 13:11:39 »
No need for a plain washer on top of the crush washer.  It's OK to use a smear of gasket goo on both sides of the crush washer just in case... 

If that doesn't work, try some stat-O-seals.  If they still leak at that point, I would be looking for a blockage in the head that's stopping oil flow into the camshaft.

Offline mada1594

  • Posts: 13
Re: Valve cover leaking from bolt.
« Reply #15 on: Aug 26, 2017, 17:52:33 »
No need for a plain washer on top of the crush washer.  It's OK to use a smear of gasket goo on both sides of the crush washer just in case... 

If that doesn't work, try some stat-O-seals.  If they still leak at that point, I would be looking for a blockage in the head that's stopping oil flow into the camshaft.

Ok great I will keep that in mind thanks for the tip!


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Offline mada1594

  • Posts: 13
Re: Valve cover leaking from bolt.
« Reply #16 on: Sep 06, 2017, 20:38:01 »
hey guys I got great news put the cap nuts and crush washers on all the studs and they are no longer leaking!

bad news is that now there is a leak coming from the back of the head gasket :( im thinking maybe I should go back in the instructed order and tighten the bolts down again bc I tightened them all down to spec but it seems that some are more loose than others after riding for a bit idk if this is due to the cylinder head flexing or the copper washers maybe still settling in after heating up from the ride???

Also if I am not able to get it fixed by tightening it down again since it is a small leak is it still fine to ride as long as I keep an eye on the oil and clean the engine off so it doesn't get gunky?