Bent Valves, what else should i do?? Need help ASAP please.

[domenico_169]

K well me and a buddy we changing my water pump and to make a long story short the timing belt jumped and the cylinder closest to the passenger side had no compression. So we took the head off and it just sitting there now. The valves are bent so i am gonna replace them, as well as the head gasket, and intake gasket. Now here comes all the questions:
1) should i replace all 16 valves? or just the 4?
2) should i change my studs?
3) I am planning on changing my piston rings cause my compression isnt all that good.
4) What else should i do at this point, whats definetley necessary?
I am in canada so i would most likely have to order my parts from the states. I dont plan on having more than 400 horse so keep that in mind.
As much input is greatly appreciated, i read other threads but everything is kinda here and there.

 

[DSMcrazy3]

DO little maintinence things..While the head is off check the deck for warpage, send the head to get machined have them check the valve guides and seats and get the head hot bathed(i believe that is what it is called). As to the valve replacement, if the other 12 are still fine, keep them if they NEED replacing..well, replace them. Change the timing belt(unless it has been recently done) change the idler pulley. get the whole gasket kit, which i believe comes with every gasket you need for anything having to do with pulling the head. It also comes with valve seals which is probably going to be needed soon, if not already...

there could be more...hope i helped

 

[domenico_169]

yeah man, thanks. thats a good start. keep the suggestions coming people. ya like i said, i dont wanna dump a million dollars into it, just wanna fix what needs to be done and maybe a tiny bit more. now a buddy mentioned something about honing it out on your own like an attachment you can put on a impact gun or something.

 

[slvrstingray]

IF YOU WANT TO DO THIS RIGHT, AND PLAN ON KEEPING THE CAR!!! --- CONSIDER THIS: Assuming that the engine may have pretty high miles, I would definitly consider having the head professionally looked at. I work at a macine shop, and have seen several of these cylinder heads that have jumped time. In general if you bend your valves usually the guide will also crack. On top of that, the exhaust guides are usually worn out around this time and will be a future cause of burning oil. Being a turbo car, they tend to be hard on the valves, as a result they might also be "tuliped." If the valves are straight, the valves can be resused and should be refaced. At the same time, have the seats cut, have the cylinderhead resurfaced, and replace the valve stem seals.

Basically to make things short, if you plan on keeping your car, it will be worth the time, effort and money to do the job right the first time! If you cut corners they will always come back to bite you! If you plan on re-ringing the pistons, you might as well change the bearings. Since you have the head off, have a valve job done, replace all the seals, gaskets, pulleys, tensioner and timing belt!

Judging by your previous posts, and the mods that you have done to the car, it seems like you want to keep you car. Talking from 9 years of experience with these cars, spend the extra money now and do it right the first time, you will not regret it!

 

[domenico_169]

could i use the same headbolts? cause then that hundred bucks can go to something else.

 

[DSMcrazy3]

IF YOU WANT TO DO THIS RIGHT, AND PLAN ON KEEPING THE CAR!!! --- CONSIDER THIS: Assuming that the engine may have pretty high miles, I would definitly consider having the head professionally looked at. I work at a macine shop, and have seen several of these cylinder heads that have jumped time. In general if you bend your valves usually the guide will also crack. On top of that, the exhaust guides are usually worn out around this time and will be a future cause of burning oil. Being a turbo car, they tend to be hard on the valves, as a result they might also be "tuliped." If the valves are straight, the valves can be resused and should be refaced. At the same time, have the seats cut, have the cylinderhead resurfaced, and replace the valve stem seals.

Since you have the head off, have a valve job done, replace all the seals, gaskets, pulleys, tensioner and timing belt!

Not to be rude....but didn't i just say the exact same thing...?

 

[TargeT]

could i use the same headbolts? cause then that hundred bucks can go to something else.

shouldnt have any problems reusing the stock headbolts.. I've reused mine many times on a couple of different dsms with out any issues.

if your doing a full rebuild (which it sounds like you are) do what was stated above, have the block hot tanked along with the head & have them check the mating surfaces of both, check the crank for scaring, replace the bearings get some better pistons & rods if you want (you can do the 1g big rods and 2g pistons, easily can take 400whp with that) slap it all together and go to town might need a new oil and water pump (do it while your there)

 

[timloomis]

it all depends on what you want to do.like these guys said though,sounds like your doing a rebuild.if you fix the head yourself,be sure to check the valve guides.they like to break when valves bend.

 

[RoasT BeeF]

Replace all the valves. Seeing as how 1 and 3 fire at the same time I dont see how it could be at all possible that you only bent valves in the #1.

 

[domenico_169]

2,3,4 had normal compression. 1 had NO compression, thats why we figure that. and there were marks on the first one where it hit, and no marks in the third.

 

[DSMcrazy3]

I took my car to have the water pump replaced. When the mechanic was pulling it in the pump locked up and snapped the timing belt, i just needed 2 Intake valves for #4..nothing for #2..but i see where you're coming from and that is weird...i'd like to know why nothing for #2 if anyone does know.

 

[timloomis]

they dont fire at the same time.its like milliseconds apart,but not the same.3 is coming up as 1 is going down.

p.s.-why did the water pump take out your valves?(dsmcrazy3).unless it sucked in the belt under the timing cover,which is pretty hard to do.

 

[DSMcrazy3]

WEll the pump is driven by the T-belt correct? the pump somehow locked up, snapping the belt...thus..inertia was a bi***...

 

[timloomis]

water pump is driven by the crank by a belt on the outside of the t-belt cover.maybe he meant your oil pump,thats driven by the t-belt.either way it sucks.

 

[1992LaserRSAWD]

my water pump blew spewing antifreeze on the timing tensioner making it go bad which threw the timing of and bent valves.