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Hairline cracks on cylinder head cover (Read 10 times)

wnplt Ex Member	Hairline cracks on cylinder head cover 06/01/05 at 09:26:01 I've just noticed a few small hairline cracks on my head cover mostly around the forward valve/rocker cover. I notice a couple more on top coming from a bolt hole. I recently did the oil plug replacement and correctly torqued the head cover. Does not look like casting marks. Any thoughts or Ideas?
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Savage_Rob

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Re: Hairline cracks on cylinder head cover
Reply #1 - 06/01/05 at 09:54:46

Did you set the engine to TDC before starting the procedure? It's not listed as part of the procedure but should be done whenever opening the head. I overlooked that and, through some discussions with Greg, determined it may have contributed to my broken bolt. I may have bolts overtorqued or undertorqued but I believe I was lucky. The cover sat back down flush without having to "pull" it down with the bolts, so I think it was probably close. Still, it was a bad oversight on my part. I am going to set mine to TDC, loosen the bolts and retorque everything.

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wnplt Ex Member	Re: Hairline cracks on cylinder head cover Reply #2 - 06/05/05 at 09:07:04 When I initially did the oil seal repair I did not set TDC. However, a week later I adjusted the valve lash because after I did the oil seal fix it messed up my valve lash and that's when I noticed the cracks on the cover.
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Re: Hairline cracks on cylinder head cover
Reply #3 - 06/05/05 at 09:14:31

wnplt wrote on 12/31/69 at 16:00:06:

When I initially did the oil seal repair I did not set TDC. However, a week later I adjusted the valve lash because after I did the oil seal fix it messed up my valve lash and that's when I noticed the cracks on the cover.

The cover is cast aluminum and not really very fancy cast aluminum, either, but it doesn't need to be. I too have noticed small cracks around bolt holes, etc, when I have looked for leaks, but none of them were ever the cause of the leak....I think you've just got a case of normal good healthy cracks Cheesy

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wnplt Ex Member	Re: Hairline cracks on cylinder head cover Reply #4 - 06/06/05 at 11:23:20 Thanks that's good to know. Really didn't want to replace the the whole head assembly. I too have no leaks of any kind from any of the cracks.
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WD Serious Thumper 2005 No Login Offline Professional "scooter trash". Posts: 5207 Rosemark TN Gender:	Re: Hairline cracks on cylinder head cover Reply #5 - 06/06/05 at 22:39:52 There isn't an aluminum motorcycle engine made that doesn't have at least a few minor cosmetic cracks in it. Just a fact of heat -vs- stress -vs- aluminum. -WD
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