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Factory Serpentine 4.2L Crank? Cut it?
Posted: August 16th, 2009, 10:04 am
by TheSpecialist
I have a 1982 CJ-8 with California emissions. The belt setup seems to be factory serpentine. Any info on this? I am about to pull it and combine with a 1993 Wrangler 4.0L HO and want to know if I need to have the end of the crank machined. All the crank facts I have read say they are all the same length, but a quick measurement with a tape shows the dampener/pulley are the same distance (OC) from the block as the 4.0L setup.
Re: Factory Serpentine 4.2L Crank? Cut it?
Posted: August 16th, 2009, 2:54 pm
by 5-90
Typically, it's the earlier cranks you have to have machined - where you have 10m/m taken off of the nose on the V-belt setups. Snake-belt setups for the 258ci crank should drop right into the 242ci block without any trouble.
Re: Factory Serpentine 4.2L Crank? Cut it?
Posted: August 25th, 2009, 6:00 am
by StroktWJ
I believe the crank number for the 4.2 crank that you dont have to remove any of the snout was the #727
Re: Factory Serpentine 4.2L Crank? Cut it?
Posted: August 25th, 2009, 2:17 pm
by laxplayermjd
when talking to my machine shop about this issue. it seemed the cheaper way out was to buy the hesco spacer for 35 than go through the extra work for machining.
Re: Factory Serpentine 4.2L Crank? Cut it?
Posted: August 29th, 2009, 8:43 am
by ccpanel
TheSpecialist wrote:I have a 1982 CJ-8 with California emissions. The belt setup seems to be factory serpentine. Any info on this? I am about to pull it and combine with a 1993 Wrangler 4.0L HO and want to know if I need to have the end of the crank machined. All the crank facts I have read say they are all the same length, but a quick measurement with a tape shows the dampener/pulley are the same distance (OC) from the block as the 4.0L setup.
BTT
i tried to measure my setup in compared to a 4.0 but i forgot to do it before i stripped the 4.0-same question...
Re: Factory Serpentine 4.2L Crank? Cut it?
Posted: September 8th, 2009, 6:02 am
by brokenujoint
i've talked to 3 different machine shops. 2 of them looked at me like i was crazy. the other one said sure no problem. we just have to send it to a guy we know. he wanted like 250.00 just to cut off the excess then re balance it. i'm not always the sharpest tool in the shed but 250 minus 35 = 215 bucks in savings by just throwing on the Hesco spacer. 35.00 seems ridiculous for a stupid spacer but its necessary. ordered mine 3 days ago.
Re: Factory Serpentine 4.2L Crank? Cut it?
Posted: September 8th, 2009, 6:49 pm
by Exos
My crank shop cut mine, no extra charge... 10mm was taken off, and you could not tell it has been done.
Re: Factory Serpentine 4.2L Crank? Cut it?
Posted: September 9th, 2009, 10:04 am
by amcinstaller
brokenujoint wrote:he wanted like 250.00 just to cut off the excess then re balance it.
holy crapanolie! how much is balancing alone worth?
Re: Factory Serpentine 4.2L Crank? Cut it?
Posted: September 9th, 2009, 3:59 pm
by brokenujoint
yeah i know... i bought the whole ground crank balanced for 150.00.. this dude was one of those perfectionist drag strip a holes... i almost started laughing when he quoted me that price.
Re: Factory Serpentine 4.2L Crank? Cut it?
Posted: September 9th, 2009, 4:14 pm
by Bodo
brokenujoint wrote:yeah i know... i bought the whole ground crank balanced for 150.00..
I've seen those cranks and you get what you pay for...