2 1/4 engine measurements needed.

[Lotz-A-Landies]

I am in the middle of a project to fit a R380 gearbox with 2.5 TD/200TDi bellhousing behind a Rover 6 cyl engine and need some information. The interface between the 4 cyl and 6 cyl bellhousings are different.

On the rear of the 2 1/4 litre engine is an aluminium flywheel housing. It could also be called an adapter.

At the top of the alloy housing are two bolts through a flange that hold the housing to the rear of the engine.

Question 1. Are the two bolts aligned horizontally to the ground/parallel to the chassis (side to side)? Or is one bolt higher than the other (which one)?

On the 2 1/4 gearbox bellhousing there are a number of studs that connect the box to the flywheel housing. There is a single stud at the top of the pitch circle (with others variously arranged around each side to the bottom).

Question 2. Is the stud at the top, at EXACTLY the 12 O'clock position, or is it off-set slightly one way or the other?

Diana

[mick88]

The Top bolt appears to be at 12 o'clock.

The two holes on the top flange appear to be horizontal to the chassis line or perpendicular to the vertical centre line. However they are not evenly spaced from the vertical line, as the hole on the right is 1 7/16" from centre and the one on the left is 2 15/16". This is looking at it from the gearbox side.
I have taken the measurements in imperial sizes for the obvious reason that it would have been designed by that code.

Diana, these measurements were taken quickly by aligning a strait edge through centre and then coming off that with a square to get the approx dimensions that you require.
I have one of these adaptor housings sitting on the bench in the shed and if you want precise measurements let me know and I will take more care to be exact.
Hope it's of some help.


Cheers, Mick.

[Lotz-A-Landies]

Thanks Mick

I also have one of the adapters in the back of the car, but need to confirm if the assumed alignment remains intact when sitting on the back of the engine. Otherwise I may end up with with the bolts a few degrees out which will rotate the entire transmission by the same degree.

What I am hoping is that someone who has a 4 cyl engine and transmission sitting in a chassis and can project the lines accurately with a straight edge and square. :TakeABow:
(I have done the same for the 6 cyl on my SIIB.)

Would take the measurments off Emmett the gun buggy, but to get the particular measurements accurately, it also requires removal of the firewall.

Diana :spudnikwaving:

[Blknight.aus]

just so happens I have juddies 2.25D and sIII 4speed IIA clutched box sitting on the bench at work...

pop up an image of exactly what you want measured up and I'll have a crack at it for you.

I suspect that you want the boltup pattern for the flywheel housing for both sides where it bolts to the engine and the bolt pattern for the bell housing stud holes.

[mick88]

Diana I have a 2A sitting here with the motor out and the front pulled off it but it has the gearbox still in it.
So I can check with a straight edge and a square to see if the top stud on the gearbox is at 12 o'clock.


Cheers, Mick.

[mick88]

What would be wrong with having a "slant four" in it anyway.
At least it would be unique.


Cheers, Mick.

[Lotz-A-Landies]

Hi Dave

Have a few images but the SIIB is not the one I measured off.

The pen line is where (hopefully) the top stud is in the 4 cyl version.

https://www.aulro.com/afvb/images/imported/2012/03/1044.jpg

Just reviewing my needs, the easiest way would be to scribe a line from the centre of the gear stick bracket using the bracket itself to square off and the space between the studs to arrive at the centre. It is likely the stud is the 12 O'clock, but would like confirmation.

The two studs in the 6 cyl are equi-distant from the vertical.
https://www.aulro.com/afvb/images/imported/2012/03/1045.jpghttps://www.aulro.com/afvb/images/imported/2012/03/1046.jpg

Not easy to see but, the 6 cyl adapter internal diameter has to be machined out 3/8" oversize. The black area is the amount that needs to be removed.

https://www.aulro.com/afvb/images/imported/2012/03/1047.jpg

if the top stud of the 4 cyl adapter is at the vertical then the new studs will be inserted on a pitch circle 13 1/2" (5/16" larger than the original circle note black arrows) and the area around the studs built up. Except that we will build up the housing first and then machine out the internal diameter and front face.

[Lotz-A-Landies]

What would be wrong with having a "slant four" in it anyway.
At least it would be unique.

Cheers, Mick.Except that it would be a slant 6, I'm fitting a 4 cyl R380 bellhousing to a Rover 6cyl, but it may give me a few mm more room in the cab! :)

[mick88]

Diana,
I just checked on a vehicle that I have the front off and the motor out of, so it's very accessible. The top centre stud hole on the gearbox bell housing is exactly perpendicular to the chassis plane.


Cheers, Mick.

[Lotz-A-Landies]

Fabulous Mick :) :) :)

I thought it would be, but there is nothing better than ground truthing the matter before I start mucking things up.

Now using the two adapter housings and the Ashcroft bellhousing I can start the necessary modifications.

Diana

[Blknight.aus]

backed up, just went and checked my spare IIA box the top stud is dead center at 12' oclock...

looking at the back of my last dead 2.25 block the bolts are level (horizontal) but I cant accurately (or easily) work out the offset from just the block with the measuring gear I have at home.