Leaking front rocker covers
- Thread starter htown16
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Fast Eddie
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htown16 said:
Sounds like excessive internal pressure to me.
Have you tried one of the various reed valve crankcase breathers?
Check the studs threaded holes in the cylinder head.
The 1/4" NC threaded hole extends into the head and oil can be pushed up the threads.
The exhaust rocker cover stud threads are kind of weird. 1/4" NC 20 tpi in the head, and 1/4" W 26 tpi for the domed nut.
And the short studs can sometimes be found to be bent.
Maybe a neat aftermarket item for a 1/4 NC x1/4 NF stud and matching thread domed nut.
The 1/4" NC threaded hole extends into the head and oil can be pushed up the threads.
The exhaust rocker cover stud threads are kind of weird. 1/4" NC 20 tpi in the head, and 1/4" W 26 tpi for the domed nut.
And the short studs can sometimes be found to be bent.
Maybe a neat aftermarket item for a 1/4 NC x1/4 NF stud and matching thread domed nut.
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make sure the value cover gaskets are not so large (oversized) that they allow oil to accumulate between the cover and the gasket when its on the bike as it acts like a reservoir - its best to trim the gaskets down a bit so they are the same width as the valve cover itself
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Do not overtighten these covers as the danger is warpage , not unlike the carb. to manifold situation. Check your torque values here and be real :wink: surprised !
htown16
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It's the 72 Commando. It's the only Norton on the road right now. The 71 and 74 are future projects. The 70 BSA and 78 Bonneville and the Sportster are regularly ridden. The Trident is this winter's project. It's not in bad shape but is coming out of long storage so needs tires, tubes, carbs cleaned, and good basic overall service
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the alloy around the cover studs gets pulled up , a little counter sink cures this..thiumphs where prone to this ,as the rocker box was over tightened.
Check out the possibility.
Check out the possibility.
milfordite
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Also check your studs. Oil will wick up around them and come out. Take them out and put a bit of sealer on the threads.
DogT
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I've found I've had to seal the studs and nuts to keep the exhaust covers from leaking. I silicone the gaskets to the covers, put a thin silicone on the engine side, and also seal the studs and nuts with silicone. I can usually take off the covers and reuse the gaskets, but I have to seal the studs/nuts. YMMV.
Dave
69S
Dave
69S
Fast Eddie
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RGM sell neoprene rocker cover gaskets see:
http://www.rgmnorton.co.uk/buy/neoprene ... et_111.htm
Has anyone tried these?
http://www.rgmnorton.co.uk/buy/neoprene ... et_111.htm
Has anyone tried these?
Nater_Potater
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Fast Eddie said:
Yep, and they work a treat. You do need to be very careful to not apply too much torque, as the neoprene will let the cover pull down deeper than the original paper would, possibly cracking the ears off.
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Pity someone does'nt make them with a O ring grove machined in...ala Modern?
Had the exact same problem you have, tried silicone gaskets, but only stopped it altogether by buying 6mm crushable copper washers and putting them on the studs before the nuts.
Also after seeing the silicone gaskets, I bought a sheet of neoprene 1mm off ebay for £2, and I've been knocking my own up with a craft knife and a set of wad punches! It's great being tight!!
Also after seeing the silicone gaskets, I bought a sheet of neoprene 1mm off ebay for £2, and I've been knocking my own up with a craft knife and a set of wad punches! It's great being tight!!
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I will give my two nickels to the thread.
I will cut a "V" notch near the lowest point for gravity drainage on the gasket to allow the oil to drain from what gets accumulated on the valve cover side. You must be careful or the gasket gets split.
Its not a perfect world but it keeps the weep to a minimum.
Silicone gaskets anyone? I have never used them but mabe a good addition to a oil drip free Commando. :shock: That's unheard of! :shock: :shock: All nortons need to scent post her Territory. :wink: It's in her nature.
Cheers,
Tom
CNN
I will cut a "V" notch near the lowest point for gravity drainage on the gasket to allow the oil to drain from what gets accumulated on the valve cover side. You must be careful or the gasket gets split.
Its not a perfect world but it keeps the weep to a minimum.
Silicone gaskets anyone? I have never used them but mabe a good addition to a oil drip free Commando. :shock: That's unheard of! :shock: :shock: All nortons need to scent post her Territory. :wink: It's in her nature.
Cheers,
Tom
CNN
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I tried the different gaskets, and they still seeped. Finally, with standard gasket and Yamabond 4 they do not leak anymore. Do not overtightened, and use some thread locker.
http://www.teamwinnebagoland.com/yamaha ... d=18326235
MF
http://www.teamwinnebagoland.com/yamaha ... d=18326235
MF
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