Merc v6 crank 2.0 and 2.5

[scd942]

Will a 1986 2.0L crank work in a 2001 2.5 block?

[iwantaVirage]

I can't remember if the '01 models still had switch boxes or if they had went to the newer ignition type... But, if it has switch boxes then you just need the top bearing cap that goes with the 2liter crank and then the proper center main bearings that fit the outside diameter of block ,and what style the cranks center main journals are(sholdered or)..
Finding which center mains to use is pretty easy, do a quick search here and I think bighammer.net also has a quick writeup on this as well...
Hope that helps a little, though it's been a while and I don't remember what year the ignition system changed and I'm pretty sure it won't work on the newer ignition style...
Good luck, hopefully someone else adds to this as well!

[scd942]

Thanks for the reply. My 01 does have a different ign system. That being said, why would that make a difference with the crank?

[tlwjkw]

think he's talkin' 'bout tha top cap... depends on tha top bearing/cap.... might need ta "modify" tha cap a tad ta accommodate tha 40 amp stator...... all tha 2.0's i've seen have tha shoulder that will work with tha larger OD plastic center mains.......

[scd942]

AH-Ha. Now were are getting somewhere. Thanks for that info. So it's the stator fit. I have an 01 XR6 and a 96 XR6 torn down. I'll check the top caps, stator and flywheel tomo, along with a 2.0 and 2.4 (200), both in the 80's.
I have 8 motors (3-2.5, 3-2.4 and 2-2.0) that need rebuilt. One 2.4 and one 2.5 have junk cranks. Just trying to get my head together about the cranks. Still have to deal with top or bottom guided rods.

[tlwjkw]

tha production 2.4 cranks (with one exception, '91 2.4 fat block) won't work in tha fat block.. they WILL NOT have tha shouldered center main crank which is a must have in any fat block (2.5 style, '91 up).. unless you have some Hi Perf stuff mixed in then rods are easy... production 5250's and tha skinny (forgot tha number) "I" beam lookin' ones will be bottom guided.. all tha "smooth" lookin' 41's will be top guided.......

[TEXAS20225]

not only the stator fit, its the crank journal diameter most all the 2.0 cranks from early motor that are 9 ring are 1 1/2 diameter top journal but not all of them the later the model crank the better of chance it will have 1 3/8 diameter top bearing all cap dont work on all cranks it requires the top cap that fits it correctly all the stators will bolt right on with one section of the 1 1/2 top cap ring cut out to accommodate part of the coils that will be to high on a early top cap with no leave out for them coils that are with the light colored wrapping on them is that clear as mud now since you have all those motor inspect them you may be able to figure it all out just by trial and error the center mains are the thing that make or breaks on the cranks gotta have the boss's on center main for a 2.5 application jus look at the 2.4 and the 2.5 c main boss you will see

[TEXAS20225]

and all this can change if somebody's been tweekin on these motors i bought cranks supposedly out of 2.5 they were 2.4 when they got here

[scd942]

Hope the pictures come up. #1 2.0, #2 2001, #3 1993, #4 1985. Here are the cranks I checked.
2001 XR6 2.5
1995 200 EFI 2.5
1993 XR6 2.5
1985 200 2.4
no year 2.0

01 and 95 are identical. The 95 has a larger O.D. machined surface than the 01
93 has no machined surface on the ctr mains
85 has small O.D. ctr main brgs. No machined surface on ctr mains
2.0 Has 1-1/2 top brg and has machined surface on ctr mains

All of the cranks had machined surfaces on the crank throws
Looks like the 2.4 and 2.5 use the same top brg.

Can all of these cranks use top and bottom guided rods?

[tlwjkw]

either tha '93 has tha wrong crank (no shoulder) or its not a "fat block".... if tha '93 isn't like the '95 and tha '01 then somethings wrong... all three should take same center bearing as will tha 2.0 crank that looks like its toast anyway..........

everyone of tha mercs (2.0. 2.4, 2.5 from day one) take tha same rod bearings....... jus that tha early ones weren't "pre-caged"..

[tlwjkw]

rods?.. never had a rod problem in "production" motors but would not do it with a stem winder (block, crank, rods all correct)......

[scd942]

The 93 has been apart before. I will now agree with you that it looks like someone put a 2.4 crank in a 2.5. So can I "assume" that all shouldered surfaces take plastic cages and non take wire cages? Both crank mains and rods.

[tlwjkw]

you got it... see above edit (#10) for rod stuff.....

[scd942]

You have been a big help. Thanks for helping a new member.

[tlwjkw]

gottcha n gl with it......