Broken plug and rocker arm

01-14-2005

Last weekend I had the talon running.Fixed a few boost leaks that I had.So finally I got to go for a test drive.Here I was going down the road driving normal.As a matter of fact I was only boosting 10psi.Then I heard kinda like a backfire.Then the car just went dead.So I have attached a pic to show what happend.

TheBlizzard · 01-14-2005

Ewwww that looks yucky.

CRAIG

**1ViciousGSX** · 01-15-2005

Anybody else thinking there is a broken or bent valve in that head? Hows the timing belt, did it jump time?

01-15-2005

Can't see image.

01-15-2005

Quote:

Originally Posted by 1ViciousGSX

Anybody else thinking there is a broken or bent valve in that head? Hows the timing belt, did it jump time?

Your right there is a broke valve.As a matter of fact,the head of the intake valve is still laying in the cylinder.When I checked the timing it was only one tooth off on the cam gears.That head had just been reworked.I got the machine shop to shave it,do a 3 angle valve job,I did all the polishing and porting.On a better note I found another motor I am going to buy for 600 bucks.

Matt D. · 01-15-2005

Did the valve actually fall out of the head or was it just piston to valve contact that made this happen?

01-15-2005

I would say the piston made contact with the valve.I guess the valve was stuck open.Then the piston came up and knocked it a good one.Maybe thats why it shattered the rocker arm.The valve stem part is still in the guide.Its the valve surface thats laying in the cylinder.Maybe I can find more out about it when I take the head off.

Matt D. · 01-15-2005

If your timing is only off a tooth and this happened then most definitely the valve got stuck open. That would only be caused by poor lubrication or poor assembly.

dsm95gsxer · 01-15-2005

shitty deal man sounds like you dropped some money on your rebuild. It wouldn't suprise me if the head of the valve is imbeded in the piston.

01-15-2005

Matt to be honest I dont know what is at fault.JET even thought maybe it could have been a lifter.(I think thats what he said)I can say that I was not running it hard or turning alot of rpms when this happend.

**1ViciousGSX** · 01-15-2005

Pull the head. If there are marks on the other pistons from contact with the valves, then the 1 tooth off was problably the reason.

01-15-2005

Quote:

Originally Posted by 1ViciousGSX

Pull the head. If there are marks on the other pistons from contact with the valves, then the 1 tooth off was problably the reason.

I took another pic of the head.You can see in this one that the stem is still in the valve guide.

**1ViciousGSX** · 01-15-2005

Hard to say from the pic, but it looks like the spring is still compressed quite a bit.

I would say the valve stem is bent and that's why the spring/retainer is still in place. The valve head was probably struck by the piston, bent the stem and then broke off to do the rest of the damage.

**1ViciousGSX** · 01-15-2005

Do any of the other followers seem loose? If so, then those valve are probably bent too.

01-15-2005

I went out to the car and checked the others.They all seem to be ok.

**1ViciousGSX** · 01-16-2005

I would either start taking that engine apart to see what's salvagable or start looking for another engine.