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Volvo 240 Automatic to Hydraulic Manual Swap

Rushin

Member
Joined
Jan 20, 2022
Hello everyone. I know this has been done to death, but during my swap I ran into some things that no one else has mentioned, and other things that were missed in other guides. I followed Dave Barton's guide for the swap and had a few bits and pieces that didn't quite fit as easily as it was made out to be. I think it would be a helpful resource. I mainly focused on the things I ran into during my swap that didn't really get covered. The other stuff can be found in much better and older guides elsewhere.



I started out with an automatic 1991 240 Wagon (B230). You shouldn't have too much of a different experience than mine across the model years until you get into the older stuff. I wanted to swap a manual into my wagon while I had the engine out. Figured it made the most sense to do so anyhow. I used an M46 transmission and driveshaft, along with the appropriate trans mount. I kept the diff ratio the same as I'm planning on an 8.8 swap in the future.



Here are the parts I used:



-M46 Trans



-Manual crossmember



-M46 driveshaft (this is important. The lengths are different as well as the connection to the input/output shaft. The M47 uses a flex joint between the output shaft of the trans and the driveshaft. Sourcing an M47 shaft was too difficult for me so I stuck with the M46.)



-Manual Pedal Box (this was from a volvo 940. I don't think the make or model matters much here.)



-STS Machining Hydraulic Clutch Pedal (I know others have done the modification without this, but I wanted something fairly hassle-free. There are lots of great guides to convert yours.)



-Wilwood hydraulic master cylinder: https://www.summitracing.com/parts/...DsvXT344GqtnJLLFh_kJArXRRt3RslExoChEgQAvD_BwE



-Custom steel braided clutch line (any hydraulic shop should be able to do this for you)



-740 Slave cylinder



-740 slave cylinder snap ring



-Manual bellhousing



-STS Machining lightened flywheel



-740 clutch fork



-Sachs Volvo 240 clutch kit



-Brass rod for clutch lever



-Long bolts and a shit ton of spacers/washers for the clutch reservoir



-The ability to not feel pain or sadness



-2.5 in Step drill bit



-90 Degree drill adapter



I started out with making sure the pedal box was squared away, meaning I had to fit the hydraulic pedal. The STS machining kit did not come with a brass rod to fit through the adapter (that connects to the pedal) they made. I'm not sure if this was a mistake, or if they just don't, but I had to get my local machine shop to make me one, they did a great job and added the groove for e-clips like I asked

2WNQ62v.jpg




Next, came the issue of clearance. When I installed the pedal, I found that the box was too narrow to facilitate movement, and completely bound the whole thing up. There wasn't any room to bend it outward, so I made a quick cut.


r2ifuJG.jpg






You can see the lower portion of the adapter (right below the cut) that travels along that path and in my box, there is no available space.



Next, I wanted to get the pedal box in to test fit, and to make sure I was going to drill the hole for the master in the right spot.



I began by removing the kick panel below the steering wheel:


b8tnB2v.jpg




There is not a lot of space, much less than there looks from this photo. It's really quite tight up there! Two of the lower bolts can be accessed with some clever extensions. Those are to the sides of the steering column, after you pull back the carpet and rubber liner. Came out no fuss. But there are a few more topside that need to be taken care of before we go any farther. There is also a bar that rides across the steering column that will need to be removed, otherwise you have no chance of getting the pedal box out. There is a U-shaped strap that goes along the bottom of the column, the left side is a captured nut, the other side needs a 13mm wrench to stop the nut on top from spinning.



Next, I moved on to removing the gauge cluster:

oZclcdJ.jpg




As you can see, you have all your HVAC piping in the way. Not a huge deal, you'll just have to pop it out. The hose that runs to the far left driver's side vent and the middle/driver's foot vent pipe with the vacuum actuator need to be removed, the others can stay

odC08mt.jpg




I commonly hear people say they've done this without removing these hoses but honestly you'll save yourself a TON of headache by just doing it. Don't try any weird tricks. You'll waste time trying to find that "perfect spot" during which you could have just removed the piping. The hose heading to the far left vent was stapled to the middle pipe on my car, I imagine it might be on yours as well. An L-shaped pick will help you get in there and pry the staples out. They aren't in there particularly tight, just enough to stop the vent from accidentally being disconnected during repairs.





Afterward, you'll be able to pull the side vent back toward the firewall, and it'll pop out. Then you can finagle it out through the top or bottom

LcuGgAA.jpg




Next, disconnect the main vacuum line from the valve.


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Now, use a screwdriver, or more ideally a trim tool to pop out the middle vent from its grommet.

BbynhOq.jpg




Congrats! The HVAC is no longer a bother.


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Now, get roughly 10-20 extensions and your 12mm. You'll see the nut quite easily now. Take that bad boy off.
BGMiJJb.jpg




Take the other nut off as well. I had to go through the extended cluster to the right side.

yJF8zOC.jpg




Now that the master cylinder isn't bolted to the firewall, disconnect the brake pedal from the brake booster.
9QGFaCz.jpg




Now the pedal box is free. Mine was stuck either from age or some sort of goo, so I had to pry it downward with a fair amount of force
sMhYYwf.jpg




Now that the box is free, comes the annoying part-getting it out. I rotated mine counter-clockwise and it was still a bastard. Lots of wires were moved around, I had to remove the turn signal switch just to get the wires out of the way in order to move the box.

uSlO221.jpg




Next, down comes the box. It will take a lot of doing, but eventually with the right combo, it'll come out.
eXIM7H6.jpg




Next, slam the new pedal box in. It's less fun as it's larger, but it'll fit up there, barely. This is where we'll make sure the hole is drilled properly and do our test fitting. Make sure to bolt the master back up and reconnect the brake pedal during this point. You most likely have a small hole pre-drilled for the clutch cable. Mine had a mystery wire running through it. Tighten everything down to ensure your master cylinder wont be mounted cockeyed when compared to the rest of the box.

l9sRQc1.jpg




This is where the 90 degree drill attachment will save your ass. It makes this part trivial. Drill the holes out for the master cylinder bolts, and use your step drill to make the master cylinder hole a little larger.


QWwtQ0W.jpg




Continued in next post. TB has image requirements from 2003.
 
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You can also see the hole from the engine bay, next to your booster.
74WwIBX
74WwIBX.jpg


After drilling, my hole was a little off-center, so I cleaned it up with a carbide bit. The step drill was constantly searching for the pre-drilled cable hole so I didn't have much of a choice.
inTQif6
inTQif6.jpg


Now, take your long bolts and test-fit your master. You WILL need to space it out, the Wilwood rod is longer than the clutch pedal travel, so ensure to adjust so the clutch pedal depresses the master fully, and then use spacers to take up the slack. I was lazy here and used a collection of bullshit to space mine out, later I'll have the spacers machined to the proper length.
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4bB8pnz.jpg


Next, get your line made. This was a little weird as the flare types were different on either side. I believe the sizing of the slave cylinder was M12, while the clutch master is some stupidass yeehaw size, 1/8 NPT. My line was 30in, and it was just enough to reach while still leaving slack in between the two.
zZDYGmf
zZDYGmf.jpg


The hard part's done! I didn't get a chance to take more pictures, but afterward it's very straightforward. Dave Barton's hydro clutch swap has awesome info when focusing on swapping the transmission and actual components, but everywhere I looked, I've never actually seen a guide on swapping the pedal box or installing the master. It's always "swap the pedal box" and it's never really talked over again. Everything else was cake, but this was a bear, especially without a guide. I hope this helps someone in the future and makes their lives a little easier. I know it would have for me.
 
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Great write up. I used a Knockout Punch kit from Harbor Freight for the master cylinder opening. It's fairly cheap and easy but the pilot hole has to be dead on center.
 
Great write up. I used a Knockout Punch kit from Harbor Freight for the master cylinder opening. It's fairly cheap and easy but the pilot hole has to be dead on center.
That's a great idea. How was clearance? Getting the hole centered was the difficult part. But a punch would make it a lot quicker!
 
Tight for the drill to fit. I ended up stalking up them Snap-On extensions just like you did and turning the pilot bit by hand.
 
And I hate to say it, but all those hydro parts likely cost more than my whole vehicle. Gotta love cheap redblocks that don't run for a stupid reason.
Going through the same thing on this one too. After my engine swap I can't get it to run for the life of me. Going to be doing lots of fun troubleshooting this coming weekend.
 
Going through the same thing on this one too. After my engine swap I can't get it to run for the life of me. Going to be doing lots of fun troubleshooting this coming weekend.
Mine was just a bad ezk, the guy trying to get it running was about to change everything other than the ezk. That was the first thing I tested. Make sure all the plugs under the intake are right. Knock can be swapped with temp sensor, IAC can be swapped with TPS. I swapped both on my last swap
 
Mine was just a bad ezk, the guy trying to get it running was about to change everything other than the ezk. That was the first thing I tested. Make sure all the plugs under the intake are right. Knock can be swapped with temp sensor, IAC can be swapped with TPS. I swapped both on my last swap
Got those figured out, still no spark/fuel. This weekend I'll be checking for voltage at all the possible trouble areas. I did swap the EZK and even the ECU from a running vehicle and no dice. I'll try swapping the IAC and TPS sensor around.
 
After my engine swap I can't get it to run for the life of me
Did you bypass the neutral safety switch wiring?

I just finished up my Auto to T5 manual swap last fall and your write up is spot on how I installed my pedal box as well. Much easier to move that HVAC stuff and just put it back in later
 
Did you bypass the neutral safety switch wiring?

I just finished up my Auto to T5 manual swap last fall and your write up is spot on how I installed my pedal box as well. Much easier to move that HVAC stuff and just put it back in later
I did that a while ago, as the contacts in the automatic transmission switch always go bad, so I just looped it with a bit of wire. If this was a manual car already, I would have liked to keep the neutral safety switch. I'm having a crank but no spark/fuel issue, it's been verified not to be anything to do with the flywheel/CPS, so I'm going to take a look at everything else this weekend, and recheck my work.
 
I am confused about the Manual pedal box replacement with one from a 940? What country are you in? That STS hydro 240 clutch pedal you just install it in your 240 with the pedal box that is in it.. Bolt it in and go I thought? Volvo never sold a 940 with manual trans in USA.
 
I am confused about the Manual pedal box replacement with one from a 940? What country are you in? That STS hydro 240 clutch pedal you just install it in your 240 with the pedal box that is in it.. Bolt it in and go I thought? Volvo never sold a 940 with manual trans in USA.
It might have been a 740, in that case. Like I said, the year and model doesn't matter too terribly much as long as you have the hole sizing for the hydraulic master cylinder. I doubt the box is from Europe, but it could be.

In my vehicle, and other vehicles, there is no area/bracketry to mount the clutch pedal or the master, so you need to swap pedal boxes. The STS pedal uses the stock location, but moves the bracket around to push instead of pull like the stock one did. If you have an auto pedal box in a 240, they do not have the extended box bit that allows you to mount a clutch pedal. You can see this in the photo where I'm removing the stock one. It's just big enough to house the brake pedal and nothing more. If yours already has that location for both pedals and the master, awesome! Lots of the hard work is done for you.
 
I suspose, my 240 has a bolted in block off plate for the hydo master cylinder. I took my stock 260 hydro clutch pedal assembly down to the twins at STS and they used that to make the hydro 240 pedals.. I also took a plastic 740 one and a custom aluminum one they got those to start making 740 ones. I got complete 240 manual cable pedal box extra I should sell it I guess.
 
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