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

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

Proper style single groove pulley for one belt applications. Original wide groove for early style belts. Fits both flat head and overhead valve motor.

Application:
4-134 engine

Fits:
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
Item # Price
645623
$32.99

Availability: In stock

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Questions: 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.
Question By: Joe Partin on Nov 12 2017 9:28 AM
Please email mike@kaiserwillys.com and I can scan in and email you over the information to fully time your Willys.
Answer By: Willys Jeep Parts Tech on Nov 13 2017 5:52 AM
Questions: 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
Question By: Glenn on Sep 10 2017 3:38 PM
Yes, you can switch to a single groove with no issue. It will also work with double as well.
Answer By: Willys Jeep Parts Tech on Sep 11 2017 11:01 AM
Questions: 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.
Question By: Jason on Mar 14 2017 1:20 PM
Yes, it will line up to the outside groove.
Answer By: Willys Jeep Parts Tech on Mar 14 2017 6:56 AM
Questions: 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?
Question By: Lucas on Sep 3 2016 12:49 PM
That would be salvage yard only. Please email mike@kaiserwillys.com your full shipping address and we can quote you out.
Answer By: Willys Jeep Parts Tech on Sep 6 2016 6:00 AM
Questions: I need the 3225201 for my CJ3B
Question By: Jorge Evertsz on Jun 8 2016 7:38 PM
The 645623 is the crankshaft pulley you need for your CJ-3B.
Answer By: Willys Jeep Parts Tech on Jun 9 2016 6:02 AM
Questions: Is this a damper?
Question By: Jorge Evertsz on Jun 7 2016 11:56 PM
I don't believe the mechanics manual ever describes it as such.
Answer By: Willys Jeep Parts Tech on Jun 8 2016 5:58 AM
Questions: 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.
Question By: bill on Jul 6 2013 12:00 AM
I would als replace part numbers: 647468 & 630365.
Answer By: Willys Tech on Jul 8 2013 12:00 AM
Questions: Does this pulley have timing groove notch...? Does the shaft hole need to be reamed to fit ...?
Question By: Anonymous on Jan 23 2012 12:00 AM
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.
Answer By: Willys Tech on Jan 24 2012 12:00 AM