6m crank, need concrete info

[suprra_girl]

is the crank in the 5m/6m and 7m the same crank?
we're needing a crank for a 7mgte engine and wanna make sure that a mk2 5m crank will work

so... are they the same?

Thanks

 

[Jeff Lange]

5M crank is shorter stroke to make the 2.8L.

6M crank is a 91mm stroke crank, and is the same as all 86-89 7M-GE and 7M-GTE cranks, in fact the early 7M's have 6M stamped onto the crank, it's the same part number.

90+ 7M's have a new crank, affectionately called the "7M" crank, it's 5lbs more than the 6M crank and has counter balances on all the cylinders (6M doesn't have any on #2 and #5).


Hope that helps.

 

[p5150]

I think that the front part of the 5m crank is different from the 6m/7m. You may have to find a custom oil seal.... Do a search on de-stroking here and at SF

 

[suprra_girl]

hehe i realise there are two cranks in the mk3

i'm looking for a replacement crank.... they are starting to get hard to come by

thanks alot for the info, really appreciate it

 

[williamb82]

5m crank is 85mm stroke. the 6m and 7m cranks are 91mm stroke and interchangeable. 5m rods are also 1/8th in longer then 6m and 7m rods. also, if using a 5m crank. youll need to use the 5m timing covers for the block and all the 5m timing gears incl cam gears(yes they will fit 7m cams) and a 5m front main seal and 5m crank pulley.

 

[IJ.]

Here ya go Suze all the Concrete info ya might need !

http://www.concrete.com/index.htm