4k Broken Cam

[ca18ae71]

hi guys i was getting my car ready too sell , i just added a 40doce Weber and a few other things, so my problem is i went to start her and it sounded weird and began to flood its self cut a long story short the timing chain pulley that attaches to the cam was lose and sheared the 10mm neck off the end of the cam and snapped the key way , my quire is while the car was running for a few short seconds will it have done damage to the valves and push-rods or anything else

[Evan G]

i demand pics! to check for bent valves, put a small amount of kero in the intake port, remove spark plug and check for any liquid in there.

 

maybe cover the port with your hand and put some air pressure in there for a more obvious results

[ca18ae71]

photos as requested

[ca18ae71]

and will the cam be fixable where the key way is cracked out now , i don't want to bin it its a big cam

[Evan G]

juicy!

 

take it/ ring a engine machinist for more usefully advice

[ca18ae71]

lol u just wanted to see carnage,

[Evan G]

correct!

 

hey i gave you some info how to check for bent valves :blinks:

[ca18ae71]

lol cheers man , are 4k's a interference motor like ca's and what not

or are they like 4a's

[Taz_Rx]

They're interference free...... with stock cam lift. :blinks:

 

Sorry to tell you but I think you'll be binning that cam. There's to much force going through that end that even if you could get it welded up then it would most likely just break again.

Edited March 1, 2010 by Taz_Rx

[ca18ae71]

noooooo i loved that cam like a child

[altezzaclub]

If you don't know what cam it is you can measure the lift and duration while its in the car and compare it to what the cam grinders offer.

 

It should have some product number stamped on it somewhere though.

 

Cost you $150 to replace it if its cut off a stock cam.

[ca18ae71]

289in 290out 470 ish

[Taz_Rx]

Just take it to a cam grinder and say "Grind me another one of these please".

Can get put a dial on it and read the specs, then duplicate it. Might just cost a little more than buying one of thier off-the-shelf grinds.

[philbey]

yeh mate it's screwed. Fatigue failure, it's always going to be at the keyway, it's the fundamental design flaw with keyways. Sharp Edge = Stress raiser = eventual fail.

 

cheaper, easier and more reliable to get the specs and get another one ground.

[ca18ae71]

thanks for the help guys, I'm going to get another std cam and grind it , cheers phill