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Question about differences in two 1994 Metro 1.0L engines; Have two 1994 engines and they are different.
Topic Started: Aug 20 2012, 09:51 AM (1,421 Views)
cwatkin


I have two 1994 1.0L Metro engines and was wondering why they are different. One was made in 1993 for a 1994 model car and the other was made in 1994.

The two main differences are in the crank/cam sprockets. The earlier engine has a crank sprocket with 4 bolts for the pulley and the cam sprocket appears to be stamped metal. It is solid with no spokes. The later engine has what appears to be a cast cam sprocket and is spoked, plus the crank sprocket has 5 bolts for the pulley.

The older engine looks like this http://geometroforum.com/single/?p=638465&t=2232748 while the newer engine looks like the one pictured at the bottom of this post http://geometroforum.com/single/?p=647523&t=2232748

The throttle body and electrical connectors appear to be identical on these two engines as I did a direct swap with no other modifications and everything has gone fine.

The reason I am asking was I had a problem with severe oil farting and was considering rebuilding my older engine while continuing to drive the newer engine until I was ready to swap it back in. The oil farting seems to be solved but was wondering if there is any advantage to using the newer engine vs. the older one. The older one is out of the car and has a burned valve. I was considering taking my time on a rebuild and continuing to drive the engine in the car until I was ready to swap. Does anyone see an advantage to using the newer style engine vs. the older one if I ever feel the need to do a rebuild? I would rather have the better engine and be without my car for a bit and have the better engine in the long run as I have two other trucks.

The car I am using is the 1993 made 1994 model so I have an older transmission (original one) in the car. Both transmissions have second gear synchro issues and I would likely do a complete rebuild on the newer transmission which is out of the car at the same time. Is there any difference in the transmissions? The other one came from the donor car that the currently running engine came out of.

Thanks,

Conor
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Good bye


They changed the sprockets and timing belt style in late 93. As far as I know that is all that they changed at that time.
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cwatkin


I see, so I would need a timing belt specified for a 1993 Metro and not a 1994 on this engine?

Thanks,

Conor
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starscream5000
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Got 70 MPG?

The new style timing sprockets shouldn't wear out a timing belt as fast. Also, some '94s have upgraded emissions, but it sounds like yours do not. Other than those things, the motors should be identical internally as nothing was changed around inside the engines from '89-'01
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cwatkin


I guess there is no reason I couldn't swap the sprockets between the two engines if I wanted during a rebuild of the older style motor.

Also, I don't know what emissions I have but do know that my throttle body has the four bolts clearly visible on top. I am told this is a newer style and both engines have this.

Conor
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starscream5000
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Got 70 MPG?

If you switch sprockets, you'll need to get the correct timing belt. The older square tooth belt doesn't work on a newer round tooth sprocket.
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clarkdw


If you have 4 bolts visible on top of the TB then you have what is California or "upgraded" emissions. I am a little surprised that the 93 is so equipped. I have not seen nor heard of the upgraded emissions being in combination with the stamped steel timing belt sprocket.

The spoked sprocket with the round toothed belt was used from May 93 through the whole 95 model year. Before that the square toothed stamped steel was used. 96+ used a sprocket similar to the 93-95 one but wider using a 1" wide belt instead of the earlier 3/4" wide one.
Either of your sets can be used on either engine in pairs and as SS5 said there are no other internal differences.
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cwatkin


I need to compare the numbers on the engine to the ones on the car and see if they are the same engine or not. Possibly the guy traded out some parts at a junkyard, but I understand this would likely involve a different harness and/or ECU. From the looks of this car, I see this as being highly unlikely.

I went out and looked at the timing belt from this engine vs. the one on my running engine and they are definitely different. The cogs are more "squared off" on the older style belt as expected.

Anyway, it is good to know they are the same otherwise if I wanted to do a rebuild. I could keep running the current one during a rebuild and swap timing components at the very end during the swap. For now, it seems I am not experiencing any issues with my engine after solving the "oil farts".

Conor

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