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broken rocker arms after cam removal 

 

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 Post subject: broken rocker arms after cam removal
Posted: Sun Aug 27, 2006 1:33 pm 
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What could cause this? I was cranking it and two lifters on the intake side broke on the edge flinging the HLA into oblivion.

Could the timing chain have jumped a tooth or two on the crankshaft when its removed?
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Posted: Sun Aug 27, 2006 3:26 pm 
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the only time i have seen rocker arms break is when the valves have hit the pistons, so your guess may be right.

 

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Posted: Sun Aug 27, 2006 3:42 pm 
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if the timing was off and the intake valve opened during the combustion stroke, what kind of damage would that cause?

 

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Posted: Sun Aug 27, 2006 3:47 pm 
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always confirm cam gear is alligned correctly to the balancer, if in doubt, confirm TDC is true.

 

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Posted: Sun Aug 27, 2006 4:26 pm 
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Yup I think i had a brain f@rt when reassembling it.

Would a tooth or two off cause this? I thought you'd have to be 4-5 teeth off for valve and piston soup

Motors coming out anyway to ensure no crap is in the sump
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Posted: Sun Aug 27, 2006 4:33 pm 
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two words:

cable tie

 

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Posted: Sun Aug 27, 2006 4:35 pm 
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JOSE wrote:
two words:

cable tie


Seven words :

Chain is cable tied to the sprocket.
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Posted: Sun Aug 27, 2006 4:45 pm 
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14 words:

Broom handle through sprocket resting on radiator support with a brick on the end.

 

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Posted: Sun Aug 27, 2006 6:03 pm 
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MacGyver wrote:
14 words:

Broom handle through sprocket resting on radiator support with a brick on the end.


Five words and an emoticon:

I should have done that :(
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Posted: Sun Aug 27, 2006 7:03 pm 
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MacGyver wrote:
14 words:

Broom handle through sprocket resting on radiator support with a brick on the end.


1 word

Unnecessary!

 

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Posted: Sun Aug 27, 2006 7:20 pm 
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MacGyver wrote:
14 words:

Broom handle through sprocket resting on radiator support with a brick on the end.


THATS DODGEY

 

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Posted: Sun Aug 27, 2006 7:43 pm 
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I remember ARM snapping a cpl of rocker arms when installing a cam, from memory he threw in an EF cam but his EL was a Hybrid (AU head).
His actually snapped when they bolted the rocker gear down.

A tooth out wouldn't cause it that's for sure.
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Posted: Sun Aug 27, 2006 8:09 pm 
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When my engine lunched itself (an auxillary gear failure), all the valves were bent (piston valve lov'n) but the rockers all fine bar one where the HLA decided sideways was a better way. Even the the rocker arm was intact, just a break where the HLA sits.

 

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Posted: Sun Aug 27, 2006 10:26 pm 
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It may be dodgy but I can guarantee that the chain will not slip off either the cam sprocket or the crank sprocket. And it tends to pull the sprocket and chain a nice distance away from the cam you are working on, keeps the chain tensioner out and allows you to slip the chain and sprocket quickly back onto the new cam.

And it works!

What more could you ask for?

 

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Posted: Sun Aug 27, 2006 10:34 pm 
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I fudged it.

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