F134 Differences

I am going to look at an F134 tomorrow to possibly replace the one I have in the Jeep right now (rings are shot). My understanding is it came out of a (?yr) CJ3B and I am planning on putting it in my ‘63 CJ6.

What should I be looking out for that may not swap over easily, accessory bracket bosses, etc? Knowing that Kaiser/Jeep likely changed little things here and there as time goes by, I would like to know what to be looking for if anything. Cheers!

-Jacob

 

I’ve had quite a few Fs and they all had the same basic blocks and heads. I’d be surprised if any were different (aside from the high altitude/higher compression models), and I’m curious of the answer.

Any of the differences that I’m aware of were in the accessories themselves, and the bellhousings/clutches.

 

Sure there were a few minor changes over the years.
But there is absolutely nothing that is not directly interchangable between 1950 through 1971 Hurricanes.
For one example: the pre 1953 heads will have cast iron rocker pillars vs the later aluminum pillars.

 

That’s what I was hoping to hear. Thanks for the reply OldTime.

 

I will look at the bell housing and pay attention to the accessories. Thank you for the reply.

 

If you have the optional 9-1/4" clutch as opposed to the 8-1/2" model on the earlier Jeeps that may present an issue. Early flywheels were only drilled for the smaller pressure plate. You might be able to swap flywheels but there were a couple different styles of alignment bolts used for flywheel to crankshaft attachment.

 

I'm a bit foggy on the details, but I believe there can be differences in the number of starter ring-gear teeth, on the flywheel. Needs to be matched with the right bendix.

Also, does anyone know, is the front plate/engine mount the same on all?

Bear in mind F-heads were used in trucks, and also had military versions - accessories and their mounts differ.

 

Unless the 3B engine is set up so you can hear it run it is a crap shoot betting it will be better than the one you already have.

Were it me, I would rebuild the one already in the Jeep unless there are worse issues than bad rings.

 

Yes in 1961 the Auburn 9-1/4” clutch assembly became available but that was not the standard prior to middle of the 1963 model year.
All flywheels after 1961 could accept either size clutch assembly.
Previous flywheels will require the drilling/tapping of 6 additional holes.
Most crankshafts remain todate having taper dowels.
The straight taper dowels are only required on crankshafts that have previously been reemed for them.

There are two basic types of bell housings.
One having dual clutch control ports.
These bells were intended to make the jeeps more universal via the RHD option.

The 2A Go-Devil engines are standard with a 97 tooth ring gear Jeep # 635394.
The 3A Go-Devil engines are standard with a 124 tooth ring gear Jeep # 641955.
The CJ Hurricane engines are standard with a 129 tooth ring gear Jeep # 802925.

Timing indicators changed as did Pcv systems but these changes are all mainly of minor consequence.

 

As noted, the dual clutch pattern became available around '63, as well as a spin-on (by-pass) oil filter around the same time. There were some changes to the crankcase venting on the block side valve cover, but these parts can all swap back and forth as needed. Around '64, an alternator replaced generators, so brackets need to be used for the appropriate charging source.
I have noted different castings for the crankshaft, some with integral cast counterweights, and others with bolt-on (then welded) counterweights, but they both are interchangeable.
I have seen reference to low and high compression options in the 1960's, but don't know how this difference was achieved, thicker head gasket maybe?
The F-head 134 is pretty much interchangable throughout the range.
-Donny

 

RE: Differences in engine mounting plates between civvy and M38A1...........Is there a difference?

 

I think the engine mounting plates are essentially the same from CJ3B on up through M38A1 / CJ5 with only some very minor differences around the bump out for the larger fuel pump, but all are interchangeable.

I notice some differences in crankcase ventilation, and the venting on the YF carburetor on the 67 CJ5 I have compared to the earlier versions.

The one in a 3B I had had the PVC vent tube coming from the side valve cover as was done on the L134s.

This one has the PVC valve attached to a fitting going into the driver side of the head along with a vacuum tube for the heater controls, the other end of the tube attaches to a tower on top of the rocker arm cover.

The carburetor has a vent tube coming out of the driver side of the top attached to a hose going to the air cleaner.

The carburetor on the 3B just had the vent tube coming out above the choke plate.

 

my '61 5 has that

 

There are different profile fans. I saw that a few weeks ago when I was messing with my radiator.

 

Huh. Interesting. I hope the fan shroud I acquired will fit.

 

As mentioned watch out if you think it's military (M38A1), Wagon or Car.

Pay attention to the mounting plate. one tang is flipped the wrong way (cars and wagons I believe). Military had a cut out for the large fuel pump but I think they will work otherwise.

Bell housing on military will not work and I believe the flywheel is different. The military had a double pulley so the generator lines up different. That's the major stuff.

(Correction, Bell housing works from M38A1 - Thanks Howard for clearing this up)

I have a wagon engine in one of my A1s so I've been through this. Yes there are many other differences like draft tube, PVC, water proofing but this stuff will not affect bolt up.

And no matter what you find, take the time to install a larger spray nozel for the timing chain if it doesn't already have it.

 

Yes there is a few minor differences, I put a Truck F134 in my M38A1.
Generator mount is different (military had a longer rubber bushing then CJ)
Front plate Fuel pump has a cut out for clearance and it is different spot on M38A1 due to using a different fuel pump.

 

there's a timing chain?