Blown Valve Cover

[oyajicool]

I found this on a forum.

http://advrider.com/forums/showthread.php?t=845549

How could this happen???

[wildBill83]

Broken valve, sending the retainer into the alum cover with engine detonation.

EDIT: Added photo so others can see the mayhem without leaving CB7Tuner.com ...

[reklipz]

Wow. I've never seen that before!

Hmmm, Honda valves. Two piece valves that like to break at the weld in high mileage engines. Had two bikes do it with catastrophic consequences. Currently replacing my Xl600rmg valves with one piece kibblewhites.

Is this true? Should I look at changing my valves anytime soon as I approach 250k miles?

[Stoner51]

My engine has 515000 miles on it. I've never had any engine work done to it. However I am about to change the head but I think I only have leaky valve seals but with that many miles on it a new head won't hurt.

Steve

[wildBill83]

Is this true? Should I look at changing my valves anytime soon as I approach 250k miles?

That quote is for high revving motorcycles. The blown valve cover was from a person trying to force the car to start after the damage was already done. As long as you don't spray starting fluid into a cylinder with a blown exhaust valve and force an ignition you shouldn't have a similar problem.

figured I'd give it one more shot before I let it go for scrap price. Hit it with a little starting fluid just in case I cleared everything out with the vacuum earlier & that there was just some water in the fuel. Now I've got a ventilated valve cover

[badfish82]

Awsome!! I love seeing the results of blatant disregard! Rule #253 if it wont start dont try too force it with starting fluid. Hahaha love the motorcycle reference too!!! wtf does your carbraited twin 600 gotta do with a f22a, like comparing the moon too the sun for similarities Some peoples children,

[ON_N20]

Yikes!

Also a defective PCV system could potenetially allow enough blow-by gasses to collect within the engine block and/or valve cover area. If they are flammable enough and there is a source of ignition.. then boom.

[oyajicool]

I think it's got a hole on the #4 piston in the beginning. Then, the starter fluid finished it.

[wed3k]

so...

ground straps were missing off a spark plug

used a vacuum

and starting fluid

think that'll fix it?

[wildBill83]

@ wed3k's comment Who needs a mechanic when you think like that huh!

[AAPOQ]

Looks like they stuck a pipe bomb under the valve cover