Did Compression test and got some weird results.

[gseclipse93]

Ok, i got my timing all squared away so its not jumping any more. but i think or im pretty sure that i bent some valves so i did a compression test to see for sure, and these are my results...

Cylinder 1 had ZERO psi! Cylinder 2, 3, and 4 all had roughly 125psi. So then i did a wet test and cylinder 1 stayed at zero, cylinder 2 and 3 jumped to about 130psi and cylinder 4 jumped to about 150psi.

What do you guys think of these results? What do you think is going on with my engine? I think i got some really bad bent valves in cylinder 1 and 2 and 3 are fine, and my rings are worn in cylinder 4. Thats what i think is going on, but i would like to know what all of you think.

thanks
josh

 

[Old Mitsu Tech]

With the zero compression it's almost a sure bet the head is coming off. If you want to look at them before you pull the head, find a mechanic with a bore scope and look at them from the spark plug hole. Most pro technicians have bought one of these overpriced things. Or, pay him to look in it for you. Anyway, figure on pulling the head.
There's been a lot of posting on timing belts lately, so do your homework and use the special tool. There's probably other ways but I've used the tool for many years and no problems yet.

Good Luck

 

[gseclipse93]

ya i agree, i know im gonna have to pull the head, its just sucks cause i just put it on last week after getting it back from the shop. but i guess thats what happens when the timing jumps and these are the things you have to deal with when owning a dsm.

 

[oldman]

but i guess thats what happens when the timing jumps and these are the things you have to deal with when owning a dsm.

how is this the fault of a DSM? Timing must have jumped for a reason and most likely due to installation error.

 

[gseclipse93]

no the installation was done the right way. the auto tensioner took a crap.

 

[Old Mitsu Tech]

Was this a brand new autotensioner? Or was it the "old" one? I've harped a bunch of times about the importance of replacing the autotensioner, the idlers and water pump etc. If this is a new autotensioner, then perhaps a warranty claim exists for you. If it's the old one, it just affirms my harping on replacing them.

oldman said it best about it not being Mitsubishi's fault. These are high performance capable engines. They deserve the respect any piece of machinery of this caliber deserves. Are they finicky? You Bet!!! That's part of the price of high performance.

Good Luck

 

[wayne71]

There is definately something to say about replacing the hydraulic tensioner. The factory released a few TSB's about it and how it shouldn't be reused. It will cost you between 80-100 dollars but it is cheap insurance when you are talking about bending valves and having to pull the head

 

[napkinthief]

There is definately something to say about replacing the hydraulic tensioner. The factory released a few TSB's about it and how it shouldn't be reused. It will cost you between 80-100 dollars but it is cheap insurance when you are talking about bending valves and having to pull the head

Its like taking a short cut through the forest on a dirt road with a dsm, you know you shouldn't do it, and you know you are going to break something, and you do, then you have to get a special tow truck to get you out.