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Any Mitsubishi experts in house?

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Chris Todd
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Any Mitsubishi experts in house?

Postby Chris Todd » Tue Jan 10, 2006 8:51 am

Hey All,
I have a 1991 Mitsu Galant 2.0 liter SOHC and it looks like the timing belt is probably broken. The car just quit on the wife about a mile from the house and I could tell a difference in cranking speed when I tried to restart it. I see no rotation when top belt cover is removed so seems to be my problem. I've done some internet searching and don't like :( what I'm hearing. Does anybody know if this...or most of this type engine is an interference type? It seems like my next move would be to pull the head and check for sure, but thought I would ask for any input here before I got out the "Metric Stuff" :shock:
It's says alot when a man has to turn to an antique tractor message board to look for these answers because he doesn't seem to "Rouse" any interest on a large Mitsu board he found. This board never seems to amaze me with the broad range of knowledge available from the members.
Thanks in advance!
Chris Todd

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Postby Bigdog » Tue Jan 10, 2006 9:09 am

Chris - I can't answer your question but if I was going to bet, I'd bet that it is an interference engine. Breaking a timing belt is never good news. Good luck!
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Postby John *.?-!.* cub owner » Tue Jan 10, 2006 9:15 am

Not familar with the Galant engine, but i do know that in 1991 many 4 cylinder engines were in the process of being redsigned to cure the problems of the pistons striking a valve left open. Ford reccomended changing the timing belt evey 30 ot 50k as a safety precaution against that.. A compression test once the belt is installed, but unless you can find someone with better knowledge I would suggest pulling the head for inspection. Most of the manufacturesr have instructions statign new head bolts should be used when a gasket is replaced. At the very least og to your local autozone, Oreilly's, etc and spend $20 for a service manual if you don't already have one.
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Postby jim turner » Tue Jan 10, 2006 9:40 am

Chris; It has been my experience that all you need to do is change the belt, the days of bending a valve have long since passed, at least I have never found one and have changed many timing belts. Hope this helps
Jim Turner

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Mitsubishi experts in house?

Postby dracer398 » Tue Jan 10, 2006 10:38 am

Hi Chris,
Did you hear any knocking when you rolled the engine over? If not, you might be OK. But...

Before installing a new timing belt, I'd pull the valve cover. Most engines have a bolt holding the pully on the camshaft. I would roll the cam over with a ratchet and watch the valve action making sure that all the valves move up and down freely. If they do, :D then I'd go for the new timing belt.

Good Luck,
Brian

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Postby Lurker Carl » Tue Jan 10, 2006 3:40 pm

Most interference engines lock up when the timing belt breaks. Camshaft stops but crank keeps turning, so valves are stuck open or closed while the pistons continue to go up and down. If a piston and valve "interfere", you can't rotate the engine. The exception is when things break bad enough to remove the interference, it's unlikely your wife was driving in a manner to allow that to occur.

Since the engine still cranks, you probably don't have major damage associated with the "interference" style engines. The funny cranking speed is likely due to some valves being open all the time in several cylinders while the valves never open in the other cylinders. The result is basically no net compression throughout the normal engine cranking cycle.

I'm thinking Mitsubishi isn't radically different from Ford, GM, Toyota or Suzuki that I've replaced in the past. The biggest challenge is getting all the stuff off and out of the way so your can snake the new belt on and get it installed properly. You might have to replace a worn idler or tension adjuster along with the belt.

Oh yeah, draw a picture of how all the belts snake around the various accessories BEFORE you start removing them. Sometimes the diagram on the engine belt sticker (if it's still there) isn't correct.
Last edited by Lurker Carl on Tue Jan 10, 2006 3:51 pm, edited 2 times in total.
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Postby Jim Becker » Tue Jan 10, 2006 9:14 pm

According to Gates, it is not an interference engine. Look here:
http://www.familycar.com/CarCare/GatesFrame.htm

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Postby Jack fowler » Tue Jan 10, 2006 9:45 pm

I work with an Ex-Mitsubishi technician and he said the 2.0 liter SOHC and DOHC are both interference engines. He also said he has done a lot of broken timing belts on both engines and about 90% didn’t have a piston /valve interference when the belt jumps or breaks. Hopefully you’re one of the lucky ones.

I personally know if it was a G.M. car you would be definitely removing the head along with replacing the timing belt.

G.M. is still building “interference” engines, but they are with chain drives instead of belt drives.

He also gave me a web site that may interest some of you.

http://autorepair.about.com/cs/doityourself/l/bl_timingbelts4.htm

Jack Fowler

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Postby Marion(57 Loboy) » Wed Jan 11, 2006 7:55 am

Well, my master mechanic friend tells me that the SOHC is NOT an interference engine.....but the DOHC IS . How's that for really muddying up the answer thread !! I think we now have every reply possible now!! :roll: :roll: :roll: :roll:

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Postby jim turner » Wed Jan 11, 2006 10:50 am

well all I can say for sure is we had about a 100 Ford 2300 engines in our fleet and I replaced a timing belt on average of one a week and never found a bent valve we also had some little Chrysler engines and never had a bent valev in any of them as well
Jim Turner

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Postby Chris Todd » Wed Jan 11, 2006 11:50 pm

First off...Thanks for all the replys. It would have taken my post a year to get the same amount on the lame Mitsu boards I have found. I pulled the head last night and think I am in the clear. I didn't see any visible damage and no carbon was disturbed on either the pistons or the valves. Timing belt failed at 140,000 miles. They say change at 60.000 so guess I got my moneys worth. I ordered a new head set and belts, picked up a manual, and will install tomorrow.
Thanks once again!
Chris Todd

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Postby Mac from NS » Thu Jan 12, 2006 7:13 am

Well Chris I think at 139000 you would have got your moneys worth.
Take a little time to play,you don't grow old as fast that way.

Mac

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Postby Marion(57 Loboy) » Thu Jan 12, 2006 8:02 am

Chris,

Check thoroughly that you can RE-USE the head bolts. You may have to buy a set designed and manufactured for use in your application.

Just an idea....may as well get the valves done while it's off....y'already did all the work!!

Marion

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Postby Lurker Carl » Fri Jan 13, 2006 11:53 am

Excellent news, Chris!
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