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Old 07-12-2019, 08:17 PM   #1
Cwazywazy
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Default M46 differences?

I thought all 240 M46s were the same except for the overdrives.. Guess not. Swapping out my '86 M46 for an older model (not sure of year) with speedo drive and ran into an issue with the clutch fork.. The new trans came with one that I've never seen and when I put in the '86 fork it only has about half travel. I'm very confused. It looks like the '86 bell housing has more depth..

The new trans did come with a throwout bearing but it's wasted and I don't know if it would even work with my clutch.. (Dogdish M47 flyhweel)

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Old 07-13-2019, 06:10 PM   #2
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If you did everything correctly you shouldn't have problems.

AFAIK, there are only 3 bellhousings for all of the SOHC 4 cylinder engines that are for the M45 and M46.

These is an early bellhousing that only fits the early M45 and M46 with course spline input shafts made through 1978. The other 2 bellhousings fit the later M45 and M46 with fine spline input shafts and are basically the same. The only difference is whether the bellhousing has the notch at the top to go around the CPS sensor which is mounted on the back of the block.
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Old 07-13-2019, 06:30 PM   #3
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The top clutch fork looks bent
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Old 07-13-2019, 06:51 PM   #4
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I just swapped bell housings. Input shafts are the same but the top clutch fork in that pic only had about half travel in the new trans before I swapped housings.
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Old 07-13-2019, 07:20 PM   #5
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The earlier style is better. Those later clutch arms are not as strong and can bend easier than the early ones. The throwout bearing is almost the same just the early version has guides to slip onto the the pins on the arm. Make sure you grease the splines and throwout bearing guide tube with high temp grease.

Last edited by dl242gt; 07-13-2019 at 07:21 PM.. Reason: a correction
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Old 08-22-2019, 08:54 PM   #6
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I'm installing an M46 from a diesel 240. There was a shim of some sort on the end of the input shaft, I got that off, and it seems the output flange is about a half inch shorter than it should be. If I'm correct I can just swap it out with a 28mm socket and an impact? Also the shifter is longer? But the output is shorter? I just wanna make sure there's no other differences that I haven't noticed.



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Old 08-22-2019, 09:00 PM   #7
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Pilot bearing is different yes you'll need to remove that spacer / shim.

The flanges, cages and selector rods need to swap yes.

They both need to be J types however.

The speedo cable drive hole will need to be plugged.

Edit:

A dime filed down a little with a piece of rubber inner tube / EDPM pond liner inside the speedometer cable collar nut will be a good plug with readily available parts from the Volvo junk pile.
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Last edited by Redwood Chair; 08-22-2019 at 09:06 PM.. Reason: Speedo Plug.
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Old 08-22-2019, 09:18 PM   #8
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Quote:
Originally Posted by Redwood Chair View Post
Pilot bearing is different yes you'll need to remove that spacer / shim.

The flanges, cages and selector rods need to swap yes.

They both need to be J types however.

The speedo cable drive hole will need to be plugged.

Edit:

A dime filed down a little with a piece of rubber inner tube / EDPM pond liner inside the speedometer cable collar nut will be a good plug with readily available parts from the Volvo junk pile.
Already removed shim, both type J, and I'm using a speedo cable. I'll find myself a 28mm socket tomorrow for the output. Manual diesels had a 3.56 rear end, right?
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Old 08-22-2019, 09:21 PM   #9
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Or an 1 & 1/8" socket.

Yep 354:1, but who's counting hundredths?
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Old 08-22-2019, 09:46 PM   #10
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Aight, so just outta curiosity, the longer diesel shifter must mean the trans sits further forwards in a diesel? But whats with the different output flange?
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Old 08-22-2019, 11:05 PM   #11
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THe diesel output flange looks like the smaller one is all. There are two different sizes on those. Smaller or bigger, but yeah they swap out. Also there is the guibo type and those swap out also.
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Old 08-22-2019, 11:22 PM   #12
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I'm late to the party here, but I was under the impression that the dogdish clutch fork is different than the one used on the flat flywheels with the gas engines. I would imagine that the ones for a diesel flywheel may be different as well.

I've got a diesel (7-series) transmission at the shop. I should compare the fork from it to one from a flat flywheel.
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Old 08-23-2019, 12:25 AM   #13
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Quote:
Originally Posted by Cwazywazy View Post
Aight, so just outta curiosity, the longer diesel shifter must mean the trans sits further forwards in a diesel? But whats with the different output flange?
Lower / smoother power = smaller driveshaft, U joints, center support bearing & flange bolts.
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