nickbean

I am about to start a repair of a broken timing chain on a 91 4x4 with a 22re. my question is this: if I break my timing chain will it deffinately bend my valves? Or if it happened at low RPM and low load could the pistons have just simply nuddeged the valves gently out of the way? Or, could it have just stopped in a position that no contact could be made?

The reason I ask because when I applied around 90psi of compressed air through my conpression tester (sort of a make shift leakdown test) I heard no air throught either the intake manifold or exhaust pipe

please help I''d really like to fix the TC without taking off the cyl. head
thanks

leebee

methinks you have a job ahead of you, iirc, the 22re is an interferance engine. meaning...

good luck.

lee

TORTIS

iTrader: (1)

i believe in God and luck. when your timing chain breaks neither are gonna help ya. when your timing chain breaks, and your piston slams into your valves, something is going to bend or break.

highway

.....x2

slacker

iTrader: (1)

you'd be surprised how easily the valves bend ... god or not .. I say 2 are bent ..

DONT just bolt it back together , do a leak down test .

SEAIRESCUE

If you pull each cylinder to TDC and shoot 90 psi into the cylinder and you hear no leak at exhaust or intake, you are good..... this is the "acid test" and what a shop would do before going ahead with just a new chain install.

Count your lucky stars and get er done. Don't forget to check the valve clearances when done. The exhaust valves have a habit of receding into the head and cutting the clearances to zero as they wear from pressure and heat.

linuxrunner

i had a chain brake in a 22re with no damage. Good Luck

stock87

No damage isn't unheard of, but it is VERY rare. Definitely test first, unless you like doing a TC job twice.

87TurboYota

On my Turbo engine the chain broke and none of the valves were bent. However, I did go completely through the engine and rebuilt it right. So it does happen but not often since engines are interferance. Hopefully you are one of the lucky ones.

nickbean

well that's good news (I hope) I'm going ahead with the TC repair without taking off the head, as I heard no air past the valves.
thanx to SEAIRESCUE for the val adjust suggestion. Considering the timing chain was never replaced it's a good bet the valves need adjusting too.
I'm picking up the timing kit and gaskets today and I'll get it changed in the next few. I'll let you guys know how it turns out

rdlsz24

Why not pull the head just to be certain things are ok? It's easier to replace the timing chain cover with the head off anyway since you don't have to worry about munching the head gasket.

Rob