1.8L SOHC engine (4G37) interference or non-interference - DSM Forums: Mitsubishi Eclipse, Plymouth Laser, and Eagle Talon Forum: DSMtalk.com
 
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Old 11-14-2007, 09:39 AM   #1
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Unhappy 1.8L SOHC engine (4G37) interference or non-interference

Hey guys I have a 1990 Mitsubishi Eclipse GS the 1.8L SOHC (4G37) engine and the timing belt broke while on the highway so the car came to a halt and I had to tow it home.

That was 3 months ago, I have never gotten around to buying a new belt because I didn't know whether it was an interference engine or not and if it is would the valves have gotten bent.

I posted at dsmsource and many users say it's a non-interference, but autozone, gates, and advance auto has replacement oem timing belt under a interference application.

I haven't been able to open the head and the block up so see if the valves have gotten bent or not.

I called the dealership and they didn't know (i wasn't surprised), I called 4 mechanics 2 have said that it was a non-interference, and 2 have said that my eclipse has no hope unless i either swap the engine or rebuild the engine and the heads and the valves.

So yea I am more confused then ever.

The dealership parts number was MD140228 which at autozone and advance auto had cross-referenced it to a Interference engine application so yea.

Am I fucked or not?

A bad thing is that the person on ebay bought it from me and he wanted me to do the repairs and he'll pay extra to me and we are both assuming it's a non-interference due to majority vote but can someone please tell me that real truth even if it's bad news.
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Old 11-14-2007, 09:43 AM   #2
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Re: 1.8L SOHC engine (4G37) interference or non-interference

Non-interference. And for future reference, you could have done a compression test. 0's on any cylinder, bent valves. Trust me, you're gas sipping baby is still alive. Go throw on a new t-belt and you'll be good to go.
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Old 11-14-2007, 10:18 AM   #3
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Re: 1.8L SOHC engine (4G37) interference or non-interference

Non-interference as kronus stated. I had the timing belt go on my original 4G37 and thought it was finished too. I asked around and found out I was good to go. I also had autozone tell me it was an interference engine, but I've had autozone tell me lots of funny stuff.
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Old 11-14-2007, 11:34 AM   #4
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Re: 1.8L SOHC engine (4G37) interference or non-interference

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Non-interference as kronus stated. I had the timing belt go on my original 4G37 and thought it was finished too. I asked around and found out I was good to go. I also had autozone tell me it was an interference engine, but I've had autozone tell me lots of funny stuff.
Exactly. I don't trust any one from a parts store, or even the stealership, for parts advice. All I trust them with is putting my money into the drawer and giving me the part I ask for. And even then, they still get it wrong sometimes. If you want really knowledge, places like dsmtalk are where you get it.
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Old 11-14-2007, 03:30 PM   #5
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Re: 1.8L SOHC engine (4G37) interference or non-interference

+1 for non interference.
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Old 11-26-2007, 01:25 PM   #6
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Re: 1.8L SOHC engine (4G37) interference or non-interference

I've had my friend who is also a mechanic look at it and told me it was an interference engine. So it might not be worth to fix up according to him.

So now what? should I trash it or is there any cheap 4G37 or 4G63T engines out there?
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Old 11-26-2007, 01:45 PM   #7
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Re: 1.8L SOHC engine (4G37) interference or non-interference

Don't listen to him! Goodness. Have we not told you that it's non interference? I've cranked my engine over with the timing belt off. And does it still run? YES. Just go grab another timing belt and put her back on the road.
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Last edited by kronus; 11-26-2007 at 01:48 PM.
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Old 11-26-2007, 01:47 PM   #8
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Re: 1.8L SOHC engine (4G37) interference or non-interference

1.8 motors are non-Interference motors. Meaning that the piston did not hit the valves. Throw a new timing belt on it and run it.
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Old 11-26-2007, 01:51 PM   #9
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Re: 1.8L SOHC engine (4G37) interference or non-interference

Also in all honesty, a timing belt takes 4-5 hours tops if you have any idea of what you are doing.
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Old 11-26-2007, 02:21 PM   #10
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Re: 1.8L SOHC engine (4G37) interference or non-interference

Replacing the timing belt on a 4G37 is very simple, I did it in about 3 hours my first time. If you decide to fix the belt and run the car be sure to replace the tensioner too. It will be a lot easier to do it now and do it right.
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Old 11-26-2007, 07:47 PM   #11
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Re: 1.8L SOHC engine (4G37) interference or non-interference

Definitely non-interference.

Just in case you weren't 100% convinced yet.
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Old 11-27-2007, 05:38 PM   #12
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Cool Re: 1.8L SOHC engine (4G37) interference or non-interference

Whether or not you haven't figured it out yet, those little 1.8's that all the turbo guys love to bash on are the engines that are the most reliable. You just cant go and throw on a timing belt on a '63 like you can with a '37. Those little guys love us, and we love them because we can laugh when we snap a belt and then just throw another one on and go on along our way. Thats some lovin.
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Old 12-01-2007, 08:55 PM   #13
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Re: 1.8L SOHC engine (4G37) interference or non-interference

I broke a timing belt at 5K RPM's. I threw a new timing belt on and went on my way. So just got get a timing belt kit, throw it on, and drive!!!
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