4 holes to give reason to changing your timing belt

[south26]

ya, well u no i had to tpye real fast wit gading papers

[tn535i]

Is it possible the belt stripped some teeth and then the 'mechanic' (may not apply in this case) rotated the cam while changing the cap and rotor which re-engaged some good teeth on the belt and then tried to start it a few more times with more dmage occuring?

I think only two valves are ever open at the same time and when a belt brakes you break those valves but it would have to slip and sorta stop and start again horribly out of time to do that.

[oldskool]

ya, well u no i had to tpye real fast wit gading papers

-nice save, irregardless.

[mooseheadm5]

Is it possible the belt stripped some teeth and then the 'mechanic' (may not apply in this case) rotated the cam while changing the cap and rotor which re-engaged some good teeth on the belt and then tried to start it a few more times with more dmage occuring?

I think only two valves are ever open at the same time and when a belt brakes you break those valves but it would have to slip and sorta stop and start again horribly out of time to do that.

Had a customer with one that broke at interstate speed. Head looked just like this. Probably skipped time or stripped a couple of teeth and kept going.

[tn535i]

When one of our M20's had a rocker break at 70 ish and the cam stopped dead in it's tracks it only bent one valve. The one where the rocker broke should have been open and was undamaged since it was closed while one other valve was open and it bent. SO I am pretty sure that a clean break couldn't do this. It would have to skip time and more or less keep going for a bit.

And why does it always seem like the exhaust side gets so much damage compared to intake. At least thats what I've noticed in many pictures? Extra heat or difference in valves themselves?

[south26]

When I took the belt off it was missing a number of teeth like it had skipped and then broke.

[south26]

to show to new people with a 528e

[cvillebimmer]

Best change da timin belt mang!

Andy, if you come across black leather in 9/10 condition for an e32, let me know. e34 would work for the front but I'd rather not bother with dying the back seat.

[Brad D.]

Best be changin' that t-belt y0!

[pleasefixitup]

who's finley?

When looking at a m20 in a e34 all I can think is, look at all this room!!!!

[SoopaGhetto]

I think I experienced some valve float...







I thought my head gasket blew. I was able to cradle it home. got all the parts for an e2i swap and had a big surprise

the rocker arm, spring, and keeper were all intact baffling

[south26]

It has been a 8 months, so hear is a reason for new people to change their timing belt.


Andy

[south26]

I thought this might be good for new members.


Andy

[Jelmer538i]

Here some carnage from an S38B36.

[tn535i]

What caused this ^^^ ?

If my S38 ever suffers that I'll cry...

[trevmmeister]

What caused this ^^^ ?

Exactly what I said. What could have possibly gone so catastrophically wrong?!

[south26]

Had that happen to a m30b35 I was parting, except it had a whole in both sides. The rod let go and all kinds of crap hit the fan.

Andy

[Owndapwn]

Man, I bet valve reliefed pistons never looked so good, huh?

[Jelmer538i]

This went boom at 160mph. I think it was the combination of lack of maintenance, chipped ECU (speed limiter removed, rev limiter raised) and the fact that the guy never let it warm up properly. The car sat for 4 months in the winter and he started it and went directly to the freeway to test the top speed.

I've seen a trown rod before but I really wonder how the pistonrings end up between the valves!! There is no room between the piston and the cilinder wall, how the heel get they past that?

[Jelmer538i]

Owh, and the rod was gone, like we never found it!! Mostly there is still a piece connectec to the crank....

[tig]

...chipped ECU (speed limiter removed, rev limiter raised) ...

Why do 'tuners' insist on doing this? Unless you are racing, what benefit is a raised/removed rev limiter?

[slammin_e28]

...chipped ECU (speed limiter removed, rev limiter raised) ...

Why do 'tuners' insist on doing this? Unless you are racing, what benefit is a raised/removed rev limiter?

Forum signature lines.

[south26]

Thought that a friendly reminder to the 528e people was a good thing.


Andy

[tig]

Thought that a friendly reminder to the 528e people was a good thing.


Andy

You are a good man.