Turbo 15B 80/40

[frankenyota]

The main reason l decided to go for the H series gearbox. I keep hearing that H55 parts are hard to come by.
I can ask him, let me know what the radiator is from and l’m sure if it’s available he will know. As we were looking at the pile of radiator brackets he was rattling off what vehicles they fit. He has spent over 30 years doing radiators and l wouldn’t go anywhere else.

 

[frankenyota]

Poor old girl has been sitting out in the weather with a cover on her and the bare metal was starting to rust more than l would have liked. So pulled the roof to try and clean it up and spray some paint on it. Found that under the rear window panel had rusted up as well so attacked it with the poly strip and primed her up. Finished off the bracing for the cab cut and cut the last sections and spot welds. Pushed the rear section back 300mm to see what the proportions look like

 

[frankenyota]

Stretched 300mm

 

[Eurasiaoverland]

The main reason l decided to go for the H series gearbox. I keep hearing that H55 parts are hard to come by.
I can ask him, let me know what the radiator is from and l’m sure if it’s available he will know. As we were looking at the pile of radiator brackets he was rattling off what vehicles they fit. He has spent over 30 years doing radiators and l wouldn’t go anywhere else.

You can still buy new H55Fs, so almost all parts are still available separately, though strangely the fifth gear set seem to be out of production. The issue is with the long 21 spline input shaft for the B Series engine.

Sounds like a great shop you've found there for radiators. I'm interested in a four-row core for a Land Cruiser 60 - it's about 610 x 400 x 60 mm.

Cheers!

 

[frankenyota]

Had a chance to do a bit more on the 40/80 build. Sorting out the clutch set up with a exceedy safari tough clutch but on cleaning up the flywheel l found the cracks were a lot deeper and probably needs to be replaced

Options are to find a better 2nd hand flywheel (not common), spend the big dollars on a new one or l can maybe source a 300mm diameter unit but would need the 2 piece bellhousing, backing plate and different starter to go with it. The bigger clutch plate will hold more power but may not be required for my application.

 

[Eurasiaoverland]

I went down the same road recently. I had a well used 15B flywheel which I took to a machine shop. I wasn't worried about cracking, but after machining it was clear that the hot-spots on the flywheel went deep and had a noticeably different texture to the non-damaged areas.

If you chose to go down the new flywheel route, I can recomend IMPEX. I got my new flywheel from them for a lot less than other online retailers.

New parts search — IMPEX JAPAN

en.impex-jp.com

 

[frankenyota]

@Eurasiaoverland will they quote on shipping when using IMPEX?

 

[Eurasiaoverland]

@Eurasiaoverland will they quote on shipping when using IMPEX?

IMPEX has a pretty clunky ordering system and they are extremely slow, but their prices are way below competitors.

You get an estimate of shipping when you order, but you don't pay this until you make a package from items which have arrived in their warehouse.

Once they pack them up, there may be an additional charge.

In my case I initially paid what the estimated shipping was, then there was a small increase to pay before the parcel was sent. The shipping was still pretty reasonable for such a heavy item. But there's always the risk you get a big increase in shipping estimate after they have your items in stock, I suppose.

 

[frankenyota]

Ok so a mate offered me a two piece bellhousing from a coaster with the H260 6 speed so l took him up on the offer to see what would be needed to work. I looked at this option before buying my adapter but could find any info.
So the 15BFTE runs the 300mm clutch and had 14mm bolts to the crank.
15BF had the 275mm clutch and has 13mm bolts, my mate said he heard of someone using a collar to space the 14mm bolts to the larger size but l wasnt too keen on that.
I had a 300mm flywheel from a 1HDFTE with a clutch in my parts so compared that and found it to be identical to the 15BFTE but with smaller 12mm bolt holes. Possibly drill the holes out to suit the 13mm 15BF crank bolts.
Both flywheels have the same number of teeth on the ring gear 117.

Next test was the height of the bellhousings and there was a difference between the single one piece dyna and the coaster two piece.
Dyna 172mm
Coaster 178mm
1HDFT 200mm
The Big4 adapter l bought is 27mm thick to match the 1HDFT bellhousing height.
So all l would need here is to get a 22mm adapter made to make up the 200mm for the gearbox set up properly.
Left is Coaster
Right is dyna with adapter
Bottom is 1HDFT

Here is the coaster vs dyna bellhousing with adapter sitting on

 

[frankenyota]

Will have to do a trial install to see whether the tunnel has enough clearance for the bigger bellhousing.
Starter motor even fits but will also need checking once installed, not sure on the teeth number for the bendix drive but will look into that if l think the 300mm clutch plate is worth the journey, then try to possibly sell the adapter with the dyna bellhousing if it all works.

 

[frankenyota]

Here’s a pic of the H151 with the bellhousing from the 6 speed coaster gearbox. Input shaft is too long by 22mm, hence why a spacer would be required. Don’t know if the 6 speed gearbox input shaft fits the H151 box

 

[frankenyota]

So some more 15B trivia. After trying to find the correct bellhousing to suit my adapter and the larger flywheel l have found there are a few different manual boxes fitted to Dynas and Coasters. Including M150, M153, H350, H351 5 speeds and H260 6 speed. The M series box has the same bellhousing pattern as an R series which is smaller than the H. The other H series share the same as the H15# style boxes.
There is differences in the lengths on the H15# and M15# series bellhousing which makes swapping and changing difficult.
15BF and 15BFT also share the same crank bolt size 13mm after speaking to someone today and checking Toyota EPC. So technically the flywheels interchange between the two sizes.
15BFTE is different with 14mm bolts, all are 8 bolt pattern design.
Another possibility is changing the H series input shafts between box’s but finding the person with information about the dyna and coaster box’s has proved difficult.
Fitted the engine and starting to layout where radiator and gearbox crossmember and everything else will fit.

 

[frankenyota]

Heres a link to some information about the 5 and 6 speed gearboxs

https://toyotamanuals.gitlab.io/dynajun2011/ncf/ncf239e/m_ch_0004.pdf

 

[frankenyota]

Received some pictures and measurements from old mate and it seems he has the correct bellhousing and flywheel assembly from a 15BFT that will suit my combination and allow me to use the adapter l have already purchased. About a 5 hr round trip to collect the parts so might have a wait till l return from working away.
Interestingly it appears that this clutch combination runs the bigger throw out bearing so no machining of the gearbox bearing retainer will be needed hopefully, this should save a few dollars. These are some pictures he sent me.

 

[bjowett]

Thank you for sharing the info about adapting the H15x. I’ve been long contemplating (several years now) on how to connect the newer H variant to my 15BFT… and have even considered going after a complete brand new H260 (there seems to be a variant that is still available and comes behind a 15BFT) , then building an adapter to bolt up the transfer case. Wish I had more to offer, you seem to found many of the same issues.

 

[frankenyota]

@bjowett if l had not already brought my adapter l would have the H series bell housing adapter spacer made to make up the 22mm, it would have been cheaper and used all the larger clutch, flywheel, throwout bearing.
Many people can't fit the larger clutch in their 40 series and opt to go for the 275mm clutch and flywheel set up.
Would you possibly have any input shaft measurements from a H260 6 speed?

 

[bjowett]

The only info I’ve found is that it is 14 spline (clutch disc). I have not found any other dimensions for it. Part number is 33301-37130. The bearing retainer is shared with many other H series including some Land Cruisers. 33131-60070

 

[frankenyota]

Correct the bearing retainer is the same across all H15#, H260, H350 with different input shaft part numbers.
I did get some measurements from someone who rebuilds H260 gearbox and the input shaft was the same length as my H15# gearbox.
Not a 100% convinced on this as the bellhousing for the 6 speed is 22mm shorter and the input shaft would physically not work according to my measurements. Unless the way it mounts in the gearbox itself is different to the H15#?
Would physically like to see one in person to measure but likely not going to happen anytime soon.

 

[bjowett]

The bearing retainer and bell housing look to mount the same way between both models. Here is an H260 from a 15BFT, certainly no substitute for measurements, but perhaps we can garner something from it.

 

[frankenyota]

So made the 5 plus hr road trip to collect the bellhousing and flywheel. Also came with an aisan branded clutch so might run that for starters. Also caught up with an old mate for a few schooners and lunch.
Next day cleaned and inspected everything and sandblasted the bellhousings and painted in some metallic silver.
Gave the top bump section of the housing a grind to give me some clearance from the tunnel instead of modifying the body.
Bolted up the flywheel to 130ftlbs and then found out l was sent the wrong spigot bearing.