This is my first DSM motor

[crzyfrk08]

This is probably really simple, however, how do I tell if I have 1G or 2G motor. I've never worked on one of these before so its very strange to me

 

[solar_eclipse89]

The 4G63 engine comes in two varieties, and they're distinguished by the number of bolts that hold the flywheel to the crank. The older six-bolt block had thicker rods and some other internal differences. The seven-bolt block replaced it sometime around mid-1992 build date.

If you have a 95-99 non-turbo DSM, this information does not apply. There is no six-bolt/seven-bolt distinction on the 420A motor. The same holds if you have a 1.8 SOHC motor.

But if you have a 2.0 DOHC 4G63 motor, read on...

If your car is a 90 or 91 and has its original motor, you have a six-bolt motor.

If you car is a '95 or newer turbo car, you have a seven-bolt motor.

 

[DSM1G90]

He's a 93NT and would have a 7 bolt motor if it's the 4G63 (2.0L) DOHC, but he could be a 1.8L (4G37) SOHC being a 1993.

 

[solar_eclipse89]

^ hes right I didnt even look at what type car it was.

 

[19Eclipse90]

Only 1Gs had the 1.8L option, so if the engine in question has a single cam gear/sprocket, it is a 1G engine or a 4G64 from a 2G. Only 2Gs had the 420A, so if the timing belt is on the passenger side of the car and the transmission on the driver side, it is a 2G engine. The 4G63 engine is not so easily differentiated.

For the 4G63 (2.0L DOHC), count the number of bolts connecting the transmission to the block that thread into the block; this disregards the bolt that threads into the transmission. On a 1G engine, there will be only three bolts. On a 2G, there are four. The attachments below should help; the bolts holes are circled in black. The first is a 1G engine (6-bolt in this case, but a 1G 7-bolt layout is no different) and the second is a 2G. Please excuse the 2G carnage. You will note the additional "web" of material on the 2G engine.

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[crzyfrk08]

Thnx everybody, this was helpful since I dont know anything about these motors. My motor is 1.8L. The original engine was swapped out for a '93 DSM motor our of an eclipse form that year. It should be a fun learning experience as I work on it.

 

[solar_eclipse89]

There is ALOT to learn but its a fun thing to get into

 

[crazysweetguy]

The 6 bolt engine was from 1989 to 1994 wasn't it offered in all the 1G cars?

 

[solar_eclipse89]

The 1GA models of 1990–1991 had the 6-bolt engine. The 1GB had the 7-bolt engine.

 

[DSM1G90]

You can either head to

All Things 1.8 - DSM Forums: Mitsubishi Eclipse, Plymouth Laser, and Eagle Talon Forum: DSMtalk.com ...

http://www.dsmsource.com/forums/forumdisplay.php?f=47 ...

or, a dedicated forum site to the 4G37 - being www.dsm1eights.org.

Good luck - DSM