piccio
30 posts
Joined: 14/12/2004 22:04:39
Location: Olgiate Comasco (CO) Italy
floating primary gear bush
Hi, ive been looking into the fully floating primary gear front bushes and i have to say they sound fantastic, however, what about the rear bush. When replacing fron and back (top hat) would this still need mashining if i used the floating front bush? cheers all
Posted: Jan 21, 2005 06:29 PM
does it need to be machine concentric to the front bush (which would now be floating) or does it just need to be reamed out? what type of tolerance should there be between the rear bush and the crank? Thanks for your help
Posted: Jan 27, 2005 04:14 AM
anyone know?
Posted: Jan 28, 2005 12:23 PM
ken@miniauto
6 posts
Joined: 08/09/2004 23:05:11
Location: woodend Australia
The clearance on the flanged bush should be .002 to .003 When fitting the gear make sure that the floating bush is not too long. I had to machine about .040 off the length to stop it from binding up
Posted: Jan 28, 2005 10:08 PM
Thanks for the info, greately appreciated,. Ill sort it out over my easter hols,when i go back to italy. Just wanted to get all the work sorted ahead of time Thanks again Mat
Posted: Jan 29, 2005 06:56 PM
4 engines gone bang
3 posts
Joined: 05/03/2005 13:39:35
Location: Bath United Kingdom (Excluding channel Islands)
Primary Gear Clearances
I am just rebuilding my engine for the 5tg time. It was a 98 1275 MPI with JC conversion. It now is a 1340 with nitrided crank to stop it being eaten away by idler gear swarf. This time a set of roller straight cut drop gears are going in but when I recieved them in the post today, the primary gear has a slight amount of wear. It is not the snug fit I expected. The front bush seems ok I have not had time to get the feeler blades out. Rear bush has some very feelable movement even with retaining ring and C washer fitted.
Any clues. The primary gear has not been reamed. Also old gear has same amount of movement. Even on old crank.
Any comments welcome. Hoping to get engine back in for start of new year.
Posted: Nov 28, 2006 06:22 PM
John
1948 posts
Joined: 28/05/2006 16:49:46
Location: cambridge United Kingdom (Excluding channel Islands)
is the play not just from the bear surfaces in ur block being warn, might need oversize bearing or sleaving it dont know if that helps or if it dosnt apply.
Posted: Nov 29, 2006 11:04 AM
Roger
17 posts
Joined: 07/02/2006 13:05:05
Location: March United Kingdom (Excluding channel Islands)
Primary gears
For you boffins on these wonderful little cars, I have a question. Is the spline of the primary gear for an automatic converter as fitted to the 1275 A+ Automatic the same as that fitted to the 1275 A+ manual clutch centre plate.
Posted: Apr 05, 2008 06:31 PM
ezekied
1 posts
Joined: 02/01/2006 20:03:54
Location: Bristol United Kingdom (Excluding channel Islands)
Oil leak through primary gear?
Oil leaking from bottom of clutch cover - replaced cltch and orange oil seal.
Oil continued to leak - replaced new primary gear and new orange oil seal.
Oil continued to leak - stripped it down again. Orange oil seal lovely and dry.
Must be coming through primary gear??
HELP
PS primary gear end float is spot on - took a lot of time to amke sure it was ok
Posted: Apr 19, 2010 11:08 AM
mark
397 posts
Joined: 18/08/2005 14:01:28
Location: Hitchin United Kingdom (Excluding channel Islands)
Constant whining sound from engine!
nar, primary gear, or drop gear
Posted: Jan 08, 2008 08:36 AM
ijp
2 posts
Joined: 14/05/2008 09:35:14
Location: United Kingdom (Excluding channel Islands)
Rattle on Tickover
All primary gears` seem to be fine
Posted: May 14, 2008 10:28 AM
Tim
1849 posts
Joined: 18/10/2004 09:40:59
Location: Bournemouth United Kingdom (Excluding channel Islands)
clutch seal protector
If you mean the primary gear oil seal, then yes.
Posted: Dec 11, 2011 03:57 PM
Joel Hoffman
Joined: 20/03/2009 02:48:11
Location: Fuquay Varina United States
Flywheel Housing Installation Problem
Last Fall, I did a thorough overhaul on a Metro engine that was previously installed in an early Mini. The engine was supposedly rebuilt about 5000 miles ago by an experienced Mini shop in the USA (where I am located). It had blown a head gasket, and I purchased it in this condition. Whoever assembled it the last time made some "errors", so I question how much experience the shop actually had. The oil thrower was installed the wrong way, causing it to rub on the double row timing chain, there was a scratch around a rod bearing shell indicating dirt when assembled, a piston had a small piece missing from the skirt. You get the idea. The engine now has been assembled properly with a replacement flowed head, new bearings, Kent 286 camshaft properly degreed in, 73.5mm pistons with 9cc dish, the compression ratio carefully measured out and set at 10.5:1, and a lot of other things ----- all put together in a clean environment. The project has been idling (pun intended) for a few months and it's time to get it moving again. I just assembled the transmission to the engine, and installed the drop gears. I did no work to the transmission as it seems good and was overhauled recently. When installing the flywheel housing, the primary gear can be easily rotated until I firm up the last two bottom bolts inside the housing. Then, it takes much more force to rotate the primary gear. If I loosen up either of the two bottom bolts, it rotates freely again. Ok, so something is binding. I've taken the housing off a couple of times trying to figure out what is causing the problem with nothing obvious seen. I can still rotate the primary gear with the two bottom bolts tight, but it takes a lot of effort. The primary gear end clearance is correct, and nothing was changed with this assembly, The thrust washers on each side of the idler gear are the same ones that were in the engine when I disassembled it, but may have been changed from one side to the other when the motor was apart. I also cannot tell if the idler gear was turned over side for side from how it was assembled originally. The bearing at the end of the first motion shaft bearing was not removed. I'd appreciate any insight into what the problem might be. Thanks!!!!!
Posted: Apr 25, 2010 07:50 PM
JK
11 posts
Joined: 15/09/2004 16:53:23
Location: WESTCLIFF ON SEA United Kingdom (Excluding channel Islands)
SLIPPING CLUTCH
IF YOU TAKE THE CLUTCH LOOK AT THE INSIDE OF THE FLYWHEEL AND CHECK FOR OIL AROUND WHERE THE PRIMARY GEAR WOULD SIT. OIL CAN GO THROUGH THE PRIMARY GEAR IF THE BUSHES ARE WORN, OR YOU HAVE TO MUCH CRANK-CASE PRESSURE.
Posted: Mar 07, 2005 05:08 PM
Posted: Mar 07, 2005 05:09 PM
Posted: Mar 07, 2005 05:15 PM
Ben1400
5 posts
Joined: 23/07/2005 21:58:54
Location: Plymouth United Kingdom (Excluding channel Islands)
Clutch Seal Protector
I think you may be thinking of the oil thrower ring, made out of a nylon type material? it has an internal spline that allows it to slide over the primary gear splines and but up against the primary gear oil seal? If so this is there so that if the primary gear oil seal in the clutch housing fails it will 'throw' the leaking oil off the crank/Primary Gear as opposed to letting it run along the primary gear and onto the clutch plate thereby avoiding the obvious problems friction material and oil combined would cause.
I have had some engines with & some without this thrower. If you have it or can get hold of one I would recommend that you fit it. However it is not designed for a big oil leak just a small amount of seepage that you would see coming out of the 'witness hole' in the bottom of the clutch housing. If oil is dribbling out of this hole no number of throwers will save your clutch plate!!!
Hope This Helps
Barry
Posted: Jan 17, 2012 12:32 PM
stuart ogden
Joined: 11/10/2011 23:08:47
Location: Kidderminster United Kingdom (Excluding channel Islands)
No gears after fitting clutch
cant engage any gears after fitting clutch assembley onto crank, could this be catching on the primary gear
Posted: Sep 22, 2013 08:13 PM
taffy1967
1783 posts
Joined: 27/09/2006 18:58:07
Location: Rhondda-Cynon-Taff United Kingdom (Excluding channel Islands)
oil leak please help me in my mayfair 1992
I believe the primary gears, idler gears and gearbox bearings can also make an unpleasant noise when worn too?
Posted: Sep 07, 2007 01:45 PM
Clutch primary oil seal
yes, just dig it out, but when re fitting a new seal, put tape around the primary gear to protect the seal when refitting the replacement.
Posted: Dec 18, 2007 02:39 PM