Whath engine Z or W

[Divette]

HI guys.
I have analysed the motor with its TY, now I need rebild crank. But I seem that in machine is installed not original motor. What define that this Z or W. Than differ cranks Z and W?

 

[jjorgensen52]

Re: Whath engine Z or W

You have a Z motor, as they came from the factory. I do not believe that the crank you get matters Z or W, except that it needs to be for a pre 1996 model and has to be for the 1 piece rear seal

 

[blander66]

Re: Whath engine Z or W

i would stilck to a crank from a non balance shaft motor, not all Z motors are non balance shaft, the blance shaft motors used a few different cranks and rods, if you mix and match you can cause problems i personlay have a few different varations and they have there differences

 

[jjorgensen52]

Re: Whath engine Z or W

all vin Z motors are non balance shaft. The L35 (vin W) and LU3 (vin X) are the only ones with balance shafts

 

[blander66]

Re: Whath engine Z or W

all vin Z motors are non balance shaft. The L35 (vin W) and LU3 (vin X) are the only ones with balance shafts

some later TBI vin Z engines did have blance shafts, i have seen this first hand and the 94 factory service manual i have shows them that way to

 

[jjorgensen52]

Re: Whath engine Z or W

some later TBI vin Z engines did have blance shafts, i have seen this first hand and the 94 factory service manual i have shows them that way to

They aren't true LB4's if they have a balance shaft... hrrm, they must have swapped the Z designation to the L35 when the new style pickups came out... makes sense because the LU3 out then too

 

[blander66]

Re: Whath engine Z or W

They aren't true LB4's if they have a balance shaft... hrrm, they must have swapped the Z designation to the L35 when the new style pickups came out... makes sense because the LU3 out then too

yea i have only seen them in new style pick ups, looking at the manual they seem to be L35's with a TBI sized cam, and i think TBI heads the manual still uses the term LB4 for the engien though

 

[Hanr3]

Re: Whath engine Z or W

Here is a fairly complete write up about the differences in teh 4.3s.
http://www.babcox.com/editorial/ar/ar39840.htm