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Double Groove Crankshaft Pulley
Fits 41-71 Jeep & Willys with 4-134 engine (Out of Stock)

Part # 646698

New Double Groove Crankshaft Pulley

Proper style double groove pulley for multiple belt applications. Originally used for M38 & M38A1. Fits both flat head and overhead valve motor.

4-134 engine

41-45 MB
41-45 GPW
46-49 CJ-2A
49-53 CJ-3A
53-64 CJ-3B
55-71 CJ-5
50-52 M38
52-66 M38A1
46-53 Truck
46-53 Station Wagon
48-51 Jeepster

Note: Must be machined for proper fit prior to install.

Part # Price





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Hello good day my question isif the Crankshaft Pulley have the timing mark thanks best regards

Willys Tech:
No they are not marked.

What machining is required for proper fit? Do you sell the key that goes between the pulley and the crank? Are the sheaves for wide or narrow belts?

Willys Tech:
They are for the narrow belts. You have to lathe the inside diameter hole to fit.

Hi What is the diameter of the double belt crankshaft pulley? The one on my 1948 CJ2A jeep is 5 inches. Thanks

Willys Jeep Parts Tech:
118866 is more the belt for your double groove pulley.


Willys Jeep Parts Tech:
646699 is what i recommend. The 646698 must be modified to work without interference.

hello what size belt is this for i use a 5/8 wide belt

Willys Jeep Parts Tech:
3/8 is the belt width.

Will this pulley fit a L134 motor with gear driven timing cover with the dust baffles? My original has 2 grooves (small and large) and fit just on just past the baffles.

Willys Jeep Parts Tech:
Please email and we can get your vehicle information and help out.

Is this the correct crank pulley for an M38 or A1, with both belt sheaves the same width? My understanding is that there is also a CJ double pulley that has one wide and one narrow sheave for use with Jeeps equipped with governors. Please verify as I am looking for M38, with double gen and water pump pulleys.

Willys Jeep Parts Tech:
Yes, this is for the M38 and M38A1. We also sell part number: 646699 too

Is this pulley considered the harmonic balancer as well?

Willys Tech:
Yes some people do call it that.

Does your company sell a bolt on timing pointer for the L134 engines? Or is there a any suggestions on how to set TDC on the pulley? Thanks

Willys Tech:
They really dont make anything like that. You should be able to get that from your flywheel markings.

I have a 46 CJ2A that I have had for years... It runs great & lots of fun, until I heard a noise coming from the crank pully. I removed the fan belt and noticed that the pully was very loose and rotated back and forth on the crank shaft ?? I tried tighting the crank shaft bolt which was tight and did not fix the problem? Do you think the pully key failed or do you think the pully & key need to be replaced? How do you get the old pully off without damaging it? What kind of puller do I need?

Willys Tech:
There is a key that locks it into place. That is probably worn. I would take a look at that. You will probably have to go buy a puller to get it off.

Is the pulley diameter wide enough to fit an M38A1? Original is 6 3/8.

Willys Tech:
Yes this should work just fine for it.
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