gear box installation BE AWARE
Discussion
tried to install the G50 gear box today, what a nightmare ...................
althoug I was reading the manual and searching the forums never I read about the NEW thrust bearing being 32 inside mm and the gear box holding tube being 34 mm outside which will end up that you can never slide the gear box on the factory provided porsche clutch !!! took is 3 attempts to realize why the hell this box was not sliding in.
So when you get a gear box, check if it has a 34 or 32 mm tube installed and is matching your thrust bearing.
The tube is fixed with 2 Philips screws that I was unable to open !
I drilled them carefully out and once the screw heads were off I could actually get out the remaining rest of the screw with a sharp screwdriver and turning it anti clock wise.
althoug I was reading the manual and searching the forums never I read about the NEW thrust bearing being 32 inside mm and the gear box holding tube being 34 mm outside which will end up that you can never slide the gear box on the factory provided porsche clutch !!! took is 3 attempts to realize why the hell this box was not sliding in.
So when you get a gear box, check if it has a 34 or 32 mm tube installed and is matching your thrust bearing.
The tube is fixed with 2 Philips screws that I was unable to open !
I drilled them carefully out and once the screw heads were off I could actually get out the remaining rest of the screw with a sharp screwdriver and turning it anti clock wise.
sorry for the plug but thread related..... G50/01 LSD gearbox for sale - same internals as G50/03 shorter casing...
http://www.pistonheads.com/sales/1176762.htm
edited to say.... LS engine adapter kit etc "may be" availble also...
http://www.pistonheads.com/sales/1176762.htm
edited to say.... LS engine adapter kit etc "may be" availble also...
Edited by craig7l on Tuesday 4th August 22:07
More nightmares with the gearbox and factory supplied clutch and especially the screws !
The screws that are fixing the factory provided clutch to the factory provided flywheel are too long
and when fully tightended are blocking the complete drive drain as the flywheel and clutch are fixed
to the adpapter plate !!!!!
Of course I only found out about this when I had the complete box installed including rear support.
So if you order this kit and the screws are 80 mm then THEY ARE TOO LONG !
I removed 8 mm of the thread and I would say 70 mm will also be ok.
A good advice is too remove the spark plugs and always assure that you can mover the clutch and flywheel by hand
to check for clearance.
THE GOOD NEWS is that I have succesfully fired the engine yesterday. Will put the video on YouTube if i manage to do that.
http://www.youtube.com/watch?v=ud7dv0nV2GA
The screws that are fixing the factory provided clutch to the factory provided flywheel are too long
and when fully tightended are blocking the complete drive drain as the flywheel and clutch are fixed
to the adpapter plate !!!!!
Of course I only found out about this when I had the complete box installed including rear support.
So if you order this kit and the screws are 80 mm then THEY ARE TOO LONG !
I removed 8 mm of the thread and I would say 70 mm will also be ok.
A good advice is too remove the spark plugs and always assure that you can mover the clutch and flywheel by hand
to check for clearance.
THE GOOD NEWS is that I have succesfully fired the engine yesterday. Will put the video on YouTube if i manage to do that.
http://www.youtube.com/watch?v=ud7dv0nV2GA
Edited by spatz on Thursday 6th August 07:37
Its also worth checking your crank still has slight end-float after fitting the drive train.
Certain crank/spigot bearing/gearbox/sandwich plate combo's will reduce the end float to zero, this in turn will toast your thrust and adjacent main bearing after only a few miles of driving.
Certain crank/spigot bearing/gearbox/sandwich plate combo's will reduce the end float to zero, this in turn will toast your thrust and adjacent main bearing after only a few miles of driving.
^ as Steve has explained. The 'thrust bearing end float' is usually only around .004" to .009", just enough to allow for normal expansion, twisting and lubrication between the crankshaft thrust faces and thrust bearing faces. You must retain this clearance though!
Also Spatz, as you are installing an LS type and if not already done, the lower part of the sandwich plate can be braced/bolted to the lower engine. This will prevent the normal slight bending of the sandwich plate and hence misalignment of the engine-trans under high load/high power applications. This is one area that is much easier to improve with an LS than SBC installations. These minor yet easily overlooked points should contribute to increased reliability and longevity.
Good luck.
Also Spatz, as you are installing an LS type and if not already done, the lower part of the sandwich plate can be braced/bolted to the lower engine. This will prevent the normal slight bending of the sandwich plate and hence misalignment of the engine-trans under high load/high power applications. This is one area that is much easier to improve with an LS than SBC installations. These minor yet easily overlooked points should contribute to increased reliability and longevity.
Good luck.
Its most probable that all is well Spatz, however the check would involve gently prising behind the front crankshaft pulley and flywheel to check for very slight movement back and forth. A quiet workshop and gentle approach to the task should result in a very slight knock as the crank contacts each of its thrust surfaces.
I took my starter out and put a dial gauge on the flywheel in line with the crank axis . Then I levered the crank back and forth on the flywheel starter ring using a screwdriver through the slots in the gearbox . This way you can see the needle moving on the gauge . .016 " new and also after 600 miles . My bad habit of resting my foot on the clutch pedal hasn't done any harm . My 1996 Land Cruiser with 120,000 miles , and 1989 Audi Coupe with 208,000 miles have had the same treatment and have their original cluches , release bearings and crank thrusts .
Frank
Frank
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