Crank Comparisons
John B. Lunsford
Asheville, NC
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87 turbo crank
87 Supra turbo crank

91 turbo crank
91 Supra turbo crank

Above you can see the two different cranks found in the 7M. The 6M crank that is found in 7M motors up to 89, and the newer design double counterweighted crank found in 90+ 7M's. The 7M crank weighs 57 lbs. while the 6M crank weighs only 52 lbs.

3 crank comparison
A: 1991 Supra Turbo 7M Crank with Pulley
B: 1990 Cressida 7M Crank with Pulley
C: 1988 Supra Turbo 6M Crank with Pulley
Notice that both 7M cranks (A) and (B) are the exactly same but use different pulleys.

6M crank mark
The 6M crank is marked with a "6M" (looks like an 8 but it's a 6).

3 crank comparison
The 7M cranks don't have the identifying mark like the 6M. All the cranks have marks at the pulley end on one of the lobes that say "K3", "I4", and "H1" (haven't checked the 87 crank yet). I'm not sure what these mean.

6 & 7M pulley
6M & 7M Supra pulley C front.

6 & 7M pulley
6 & 7M Supra pulley C back.

7M Cressida pulley
7M Cressida pulley B front.

7M Cressida pulley
7M Cressida pulley B back.

The Cressida pulley (B) weighs 12 lbs. 0 oz. and the Supra pulley (A) weighs 10.0 lbs. 6.5 oz. The other Supra Pulley (C) is the same as (A) but weighs slightly more at 10 lbs. 7.5 oz.

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