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4.2 harmonic balancer

Swaping 258 to 4.0, 4.0 parts to 258 etc!
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Shrek
Posts: 9
Joined: December 12th, 2018, 8:43 am
Vehicle Year: 1989
Vehicle Make: Jeep
Vehicle Model: Wrangler

4.2 harmonic balancer

Post by Shrek » June 18th, 2021, 8:41 am

I have a 89 4.2, and would like to convert form a "V" belt to a serpentine belt.
Will a 4.0 harmonic balancer fit and function on my 4.2 crank? I am in the process of putting a 4.0 head on a rebuilt block.

TIA

rlinares40
Where's the "any" key?
Where's the "any" key?
Posts: 27
Joined: December 3rd, 2020, 9:38 am

Re: 4.2 harmonic balancer

Post by rlinares40 » June 18th, 2021, 9:50 am

Shrek wrote:
June 18th, 2021, 8:41 am
I have a 89 4.2, and would like to convert form a "V" belt to a serpentine belt.
Will a 4.0 harmonic balancer fit and function on my 4.2 crank? I am in the process of putting a 4.0 head on a rebuilt block.

TIA
I would believe so as we can use your crankshafts on our 4.0s. where I can see you running into the problem is with the accessories, they are driven by a "V" belt pulley correct?

rlinares40
Where's the "any" key?
Where's the "any" key?
Posts: 27
Joined: December 3rd, 2020, 9:38 am

Re: 4.2 harmonic balancer

Post by rlinares40 » June 18th, 2021, 9:52 am

rlinares40 wrote:
June 18th, 2021, 9:50 am
Shrek wrote:
June 18th, 2021, 8:41 am
I have a 89 4.2, and would like to convert form a "V" belt to a serpentine belt.
Will a 4.0 harmonic balancer fit and function on my 4.2 crank? I am in the process of putting a 4.0 head on a rebuilt block.

TIA
I would believe so as we can use your crankshafts on our 4.0s. where I can see you running into the problem is with the accessories, they are driven by a "V" belt pulley correct?
meaning it does no good to have a serpentine harmonic balancer when your alternator pulley is "V" styled.

Shrek
Posts: 9
Joined: December 12th, 2018, 8:43 am
Vehicle Year: 1989
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: 4.2 harmonic balancer

Post by Shrek » June 20th, 2021, 5:14 am

Thank you for the reply. :cheers:

I am changing the power steering pump, water pump, and the alternator to a serpentine belt. An idler pulley will need to be installed as well.

I spoke with Russ Pottenger, and found that I can use a 4.0 balancer, but will need a spacer, which I purchased from him.

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