[urq] Is the wx an interference engine?

[Carl C.]

Thanx for the input and ist.  Doesn't put my mind at peace mind u, I din't count the teeth but 1/3 turn on the crank is what maybe 5 teeth ? 
Weather is clearing up so ill do the ring oil test soon and see if i get close to the 130 hope so. From the readings would 10psi justify pulling the head off if a valve is indeed slightly bent? Don't want it to break off down the road either...


> From: larichard at plguide.com
> To: 007css at live.com; urq at audifans.com
> Subject: RE: [urq] Is the wx an interference engine?
> Date: Thu, 12 Feb 2009 15:02:13 -0500
> 
> -----Message d'origine-----
> 
> I read around and had mixed results. Is the wx engine an interference
> engine?
> 
> >>Yes. I have some pistons here to prove it... 
> 
> 
> The other day i moved my car (intense cold the night before) it fired right
> up and i turned off the ignition.
> A few days later i come back and try to crank it nothing, no fuel pump, etc.
> So i start to wonder look at the wiring since i put a mac10 in there.
> Nothings wrong go to the hall, not at tdc! Look at the cam not there either.
> Now i got kinda scared. The belt was loose and there was some scrunched up
> squirrel nuts no joke! , i knew it was loose tho and was planning on
> changing it to the newer longer style and adding a belt tension pulley. Same
> reason i dint put to cover back on and nuts managed to find their way in the
> bottom cover. Anyways it turned like 1/3 or is it 4/3? a crank turn from the
> cams tdc. 
> 
> >> How far was the belt from its normal position ? A few teeth ? 
> 
> Now i put the cam at tdc and was able to do a whole crank turn by rolling
> the crank by hand with no belt on. Note it was really cold so less
> compression and i did it slowly. 
> 
> >> it just means that all cylinders had an open valve/spark plug. 
> 
> Anyways that told me that there's no broken valves but none were interfering
> either at that point. So put back the belt on and tightened it. Did a few
> engine turns with a 19mm to make sure i dint miss any sheared belt teeth
> then started it up till warm. Then did a compressions check. Not very
> high... ~120  cyl #2 is at 110psi Are these numbers normal for a high
> mileage engine? I think new its supposed to be at 130psi ?  
> 
> >> From IST : Acceptable is 7-9 bar (102-131 psi). Minimum is 5 bar (73
> psi). Max difference between high and low is 2 bar (29 psi). 
> 
> So i am a lil worried atm that i have slightly bent valves. 
> 
> >> I'm guessing the valves are OK. 
> 
> If they are interference how  much oil in cyl do i need to put to test the
> valves? 
> 
> >> Oil is for testing rings, not valves. 
> 
> Thanx
> 
> Let us know, but I guess that engine is still OK.
> 
> 
> Louis-Alain
> 
> 
> 

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