Help w/SIx Bolts 3F (or 2F) Bellhousing to 3F Block

[4Cruisers]

I've pretty much exhausted my search of the IH8MUD forums and internet in hopes of finding the part number (if any) for a suitable Toyota bolt for attaching the 3F bellhousing to the 3FE for my 3FE/H55f conversion (into my '86 FJ60). I'm looking for M12-1.75X45mm bolts - I wasn't aware until I was mounting the 3FE to the engine stand that the threads in the six holes in the 3FE block have a 1.75mm pitch, so can't use the bolts that attached the 3F bellhousing to the 2F (1.25mm pitch) in my '86 FJ60. I may have found a part number for a Camry A/C compressor mounting bracket bolt - 91161-71245 (I know it's a 12mm diameter bolt 45mm long, but am guessing at the thread pitch). I might just have to order one (if available) to see if it's what I'm looking for.

Any help would be much appreciated. And yes, I've being taking numerous photos as I proceed with the conversion - will post them on a new thread when I have a little more time.

 

[zebrabeefj40]

McMaster-Carr <-- Linky to the bolt you are asking for from McMaster-Carr...

 

[OGBeno]

How about the bolts used to attach the bellhousing when the A440F was attached?

 

[cruisermatt]

I could be wrong but I think you might need the clearance of the smaller headed JIS (Toyota) bolt for this application, the 19mm head on a normal Rest-of-world metric bolt might not fit. I have a 3F bellhousing in my backyard and will check real quick.

 

[cruisermatt]

No clearance issue, anything you find at the hardware store will be fine, Class 8.8 or 10.9 preferably but for this application it really doesn't matter.

 

[4Cruisers]

Thanks all!

zebrabeefj40 - I found some great bolts at the link you sent me: High-Strength Zinc Yellow-Chromate Plated Cap Screw, Class 10.9 Steel, M12 Thread, Pitch: 1.75, 40mm Long - I'm ordering 10 this morning, only $12.22 for a package of 10!

beno - Thanks, your reply reminded me to go out in the garage and actually take some measurements - the 4 lower bolts are 35mm long and give me 6mm more thread engagement using the 3F bellhousing, so they would work fine. The upper 2 bolts are 70mm long and wouldn't work w/o a sleeve - I'd rather not go that route, but buying 2 additional bolts with the same part number locally through Dan would be an option.

cruisermatt - Thanks for confirming - I measured a 22mm diameter available for clearing the 19mm head of the McMaster-Carr bolts I'm ordering.

I guess I'm a little surprised that the thread engagement for the 4 lower bolts mounting the A440F to the block is only 15mm, and only 21mm for the 2 upper bolts - the H42 to 2F block thread engagement for all 6 bolts is the full 30mm depth of the hole.

Little by little this is all coming together - will deliver the 3FE to the machine shop the first week in January, menwhile I'll be ordering the last-minute belts, filters, hoses, clamps, and gaskets needed. It's taken a little longer than I thought to disconnect and pull the engine and transmission - I've been working on the driveway, and most days the highs haven't cleared freezing, plus we get snow about every 2 or 3 days.

John

 

[4Cruisers]

Turns out the 40mm long bolts from McMaster-Carr are a little too long - I shortened 2 of them (for the upper bolts) a bit this afternoon. Will use the 35mm long bolts from the A440F for the lower 4 bolts.

I also did some research on flywheel bolts (before I discovered I had already purchased 6 new 2F flywheel bolts a while back (90913-01016)). The A440F drive plate flange bolts are 23 mm long - with the thickness of the drive plate and 2 spacers, that leaves about 15mm of thread into the crankshaft. The 2F bolts are 32mm long - with the thickness of the flywheel, that leaves about 21mm of thread into the crankshaft. I just dropped my 3FE off with the machine shop for a much-awaited rebuild on Friday, so I can't measure the depth of the threaded hole in the crankshaft. I don't know whether or not the 32mm long bolts will bottom out in the 3FE crankshaft or not. Before I order some aftermarket bolts from Summit Racing (ARP 203-2802), I'd like to see if the 2F bolts will work. Does anyone have an early FJ62 3FE sitting in their shop that they could measure the threaded depth of the holes in the crankshaft? Any help would be appreciated.

John

 

[Godwin]

Can't help with any measurements of depth of threaded hole in the 3FE crankshaft. I have an '88 3FE block with crank lying around and if I remember can get a measurement sometime later.

The 3FE I used to swap into my FJ60 was an '88 and I reused the 2F flywheel bolts and had no issues with them bottoming out. These bolts were first used on the original 2F and now the 3FE and have seen >300k miles of use.

 

[cruisermatt]

The 3FE I used to swap into my FJ60 was an '88 and I reused the 2F flywheel bolts and had no issues with them bottoming out. These bolts were first used on the original 2F and now the 3FE and have seen >300k miles of use.

x2, I used 2F flywheel bolts and it was fine.

 

[4Cruisers]

Thanks guys! One less last-minute parts order.

 

[toy_tek]

I've pretty much exhausted my search of the IH8MUD forums and internet in hopes of finding the part number (if any) for a suitable Toyota bolt for attaching the 3F bellhousing to the 3FE for my 3FE/H55f conversion (into my '86 FJ60). I'm looking for M12-1.75X45mm bolts - I wasn't aware until I was mounting the 3FE to the engine stand that the threads in the six holes in the 3FE block have a 1.75mm pitch, so can't use the bolts that attached the 3F bellhousing to the 2F (1.25mm pitch) in my '86 FJ60.

How about the bolts used to attach the bellhousing when the A440F was attached?

the 4 lower bolts are 35mm long and give me 6mm more thread engagement using the 3F bellhousing, so they would work fine. The upper 2 bolts are 70mm long and wouldn't work w/o a sleeve

I guess I'm a little surprised that the thread engagement for the 4 lower bolts mounting the A440F to the block is only 15mm, and only 21mm for the 2 upper bolts - the H42 to 2F block thread engagement for all 6 bolts is the full 30mm depth of the hole.

Turns out the 40mm long bolts from McMaster-Carr are a little too long - I shortened 2 of them (for the upper bolts) a bit this afternoon. Will use the 35mm long bolts from the A440F for the lower 4 bolts.

I haven't found (or recall reading) any other posts about the upper bolts for the H55 bell housing to 3FE. I have the earlier bell housing if it makes any difference. Would the same bolts as the lower 4 positions (35mm long) also work for the upper? If so - any idea what the part number is?

Found these, I'll probably order a few and deal w a 19mm head.

Hex Bolts 10.9 M12X1.75 Coarse DIN 931/933

Bel-Metric sells metric hardware & specialty automotive supplies nationwide. Visit our website to purchase metric fasteners, nuts, bolts, Time-Sert kits & more.

belmetric.com

I also did some research on flywheel bolts (before I discovered I had already purchased 6 new 2F flywheel bolts a while back (90913-01016)). The A440F drive plate flange bolts are 23 mm long - with the thickness of the drive plate and 2 spacers, that leaves about 15mm of thread into the crankshaft. The 2F bolts are 32mm long - with the thickness of the flywheel, that leaves about 21mm of thread into the crankshaft...

Conversely - do people ever use the A440 flex plate bolts for the manual flywheel when converting? I've read a few threads mention obtaining the 90913-01016 2F bolts (which are now about $6 each), and a handful of A440-H55 swap threads that don't mention flywheel bolts at all. My flex plate bolts would fit, but I only measured 11.36mm of engagement. According to the above post, at almost double the amount of thread engagement, I'm inclined to order the 2F bolts and wait, but wondered about this.