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Single Groove Crankshaft Pulley
Fits 41-71 Jeep & Willys with 4-134 engine

Part # 645623

New Single Groove Crankshaft Pulley (Imported)

Proper style single groove pulley for one belt applications. Original wide groove for early style belts. 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

Part # Price





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There is a double groove pulley on the crankshaft of my 1949 CJ3a. The water pump is single pulley and so is the generator. There is nothing else requiring a belt. Can I just order a single groove crankshaft pulley? Thank you.

Willys Jeep Parts Tech:
Yes, single groove is what you should have on that vehicle.

when installing a new pulley what is the best way of doing that? The Crankshaft is not threaded for a installation tool.

Willys Jeep Parts Tech:
They really should just slide right on. A tight slip fit. Sometimes you have to tap into place.

After doing the flywheel timing (mechanical rotation to "IGN" on flywheel gear) , how do I know how to mark this pulley for use of a timing light? My timing gear cover has no lines; just a raised area where it looks like the lines should be. Engine S/N 4L (R?) 128872. Thanks.

Willys Jeep Parts Tech:
Please email mike@kaiserwillys.com and I can scan in and email you over the information to fully time your Willys.

I have a1961 CJ5 with the double pulley. It appears that I only need a single pulley (belt groove) for water pump and generator. Can I use this with the stock setup? I plan to add a 12 volt alternator also. Thanks, Glenn

Willys Jeep Parts Tech:
Yes, you can switch to a single groove with no issue. It will also work with double as well.

Does this shiv line up with the water pump? I have a 2 groove that is beat up but only need a one groove to run water pump and alternator. The grove that is used now is the outer one and it is aligned with the water pump. Thank you in advance.

Willys Jeep Parts Tech:
Yes, it will line up to the outside groove.

Do you have a similar pulley that'd fit a 226l engine? I have double cs and I need a 3rd one (single) for the steering. If you have the Pulley, Can you ship to Chile? And Aprox shipping time?

Willys Jeep Parts Tech:
That would be salvage yard only. Please email mike@kaiserwillys.com your full shipping address and we can quote you out.

I need the 3225201 for my CJ3B

Willys Jeep Parts Tech:
The 645623 is the crankshaft pulley you need for your CJ-3B.

Is this a damper?

Willys Jeep Parts Tech:
I don't believe the mechanics manual ever describes it as such.

When replacing the crank pulley do you have to replace any seals,Etc. I would want to replace the crank nut. There is a wobbling in the pulley. probable the original.

Willys Tech:
I would als replace part numbers: 647468 & 630365.

Does this pulley have timing groove notch...? Does the shaft hole need to be reamed to fit ...?

Willys Tech:
You'll have to mark it once timed. The shaft hole should slide over without any major issues. We have not had any problems with this pulley.
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