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+--- Thread: Lining up chummy engine with its gearbox! (/showthread.php?tid=1387)
Lining up chummy engine with its gearbox! - dockerpt - 25-06-2018
Good day
I removed my wife’s chummy engine
so I could swap out the ring gear.
All done....trying to offer engine back up to
gear box....
Someone help with tips and magic!!!
Any advise gratefully recieved!!!
Best
Pete
RE: Lining up chummy engine with its gearbox! - Nigel was in Brittany - 25-06-2018
Don't forget there is a blind spline on the clutch center plate, its much easier with the gearbox removed and assembled to one unit on the bench (floor )
RE: Lining up chummy engine with its gearbox! - "Slack Alice" Simon - 25-06-2018
I have just done this. Was not looking forward to it.
Before anything else, the clutch plate has to be centred. I have a very crude piece of thin ally with a hole chiselled out of it, but it does the job. Almost impossible if not centred.
Front of car up on axle stands as high as they will go, and one rear wheel off the ground.
Engine in, not bolted down, as far forward as it will go.
Blind spline at top dead centre.
Gearbox in top, with blind spline at tdc also, as best you can judge.
From underneath, lift gearbox and offer up to engine. You can tell by the relationship of gearbox flange to the stud ends as to whether it is tilted or more or less evenly spaced all round.
Jiggle the box and push towards engine. If it doesn't mate, keep contact with the engine and rotate the gearbox output shaft one spline clockwise, using the propshaft flange. Usually you can feel the next spline position, though it isn't easy whilst holding the box.
Balancing the box on a jack helps, but I didn't need it this time.
No joy? try another clockwise spline, then one or two anticlockwise.
Still no good? Check alignment - is everything squarish on? Did you REALLY centre the plate?
I was lucky - it went in second go.
If it had taken more than half an hour, which it can if it is being unkind, then I would have taken the weight of the box on a jack, and maybe replacing two studs with longer ones to help guide and take the weight a little, also.
Or put engine and box in in one go. Which I didn't want to do, and luckily, didn't have to.
Cheers
Simon
RE: Lining up chummy engine with its gearbox! - Rick F - 25-06-2018
My 1929 Chummy engine/gearbox combination does not have a blind spine.
The hardest job on engaging gearbox is getting the floppy levers to fit into the slots on the release bearing. I usually tie them together with a bit of string and cut it off after mating.
RE: Lining up chummy engine with its gearbox! - Viteran - 25-06-2018
Does anyone know the logic behind the blind spline, ? it seems unnecessary. I first came across it when I was about 16, but 50 years later I know a lot more magic words to help
Ian
RE: Lining up chummy engine with its gearbox! - John Mason - 25-06-2018
The subject of the blind spline was chewed over at some length on the old forum without any real result. I myself think it was for quickness in assembly at Longbridge when on the production line.
John Mason
RE: Lining up chummy engine with its gearbox! - dockerpt - 25-06-2018
Best Got the engine and box to mate still not right even less travel
on clutch peddle bugger.... not enough travel in peddle and slight
drag when you rock the car with clutch pedal pushed....
The little arms aren’t quite all the way in their slots?
Have I screwed up the clutch assembly when
I swapped the ring gear?
RE: Lining up chummy engine with its gearbox! - Robert Leigh - 26-06-2018
(25-06-2018, 08:50 PM)dockerpt Wrote: Best Got the engine and box to mate still not right even less travel
on clutch peddle bugger.... not enough travel in peddle and slight
drag when you rock the car with clutch pedal pushed....
The little arms aren’t quite all the way in their slots?
Have I screwed up the clutch assembly when
I swapped the ring gear?
It sounds strange that any Chummy would have a master spline. Unless someone has changed things all A7s with three speed boxes did not have a master spline at manufacture.
RE: Lining up chummy engine with its gearbox! - Ruairidh Dunford - 26-06-2018
I have several three speed boxes with Master Splines Robert - they are a total pain!
RE: Lining up chummy engine with its gearbox! - Mike Costigan - 26-06-2018
Indeed; every three speed car I've owned has had a master spline.