MG-Cars.net

Welcome to our resource for MG Car Information.

Recommendations

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MGB Technical - MGB clutch problem

I can't seem to get the air bled from my 1967 MGB clutch system. Master and slave cylinders have been replaced along with clutch, throwout bearing, pressure plate. I bleed until fluid is clear of any air. The system works fine for about 1-2 strokes of the clutch and then it starts to growl. I notice a lot of tiny bubbles in the master cylinder if I push the clutch pedal in several times after bleeding. Any chance I got a bad new master cylinder. It seems that is shere the air is being introduced.

Any suggestions.

Thanks
D Deaton

I post this periodically. Tried bleeding my 69 too many times to count and it seems to be a frequent problem for LBCers from posts on here and other BBS. Asked a VERY experienced mechanic friend. (30 years of LBC and other experience). Bleed it backward. Use small pump style oil can, put hose on end that will fit slave cylinder nipple, fill can with fluid, , empty clutch system of fluid, then attach hose to slave nipple, open nipple up and pump fluid back up through system and close nipple when pump stroke compressed. I was using DOT 5 which is notorious for small bubbles and it worked the first time. 5 minutes.
J.T. Bamford

I have had good luck bleeding the MGB clutch
with the gunson's eezibleed, although even with
this method a second bleed might be necessary to
get all the air out.

The Gunson's also makes bleeding the B brakes
trivial.
Ronald

D Deaton - Disconnect the slave push rod from the clutch fork and push it all the way into the slave, pushing the slave piston all the way to the back of the cylinder, then reblead in the normal fashion. You may have to repeat this procedure a couple of times, but it will get all the air out of the system. Good lcuk - Dave
David DuBois

I used the EeziBleed to reverse *fill* the system from the slave nipple, didn't need any bleeding at all.
Paul Hunt

Thanks for the reply. I did the reverse bleed and that did the trick! Appreciate the comments!
D Deaton

The MGB's clutch is actually self bleeding!

I replaced the master cylinder on my car the other day and all I did afterwards was to fill the tank 3/4 full and pump the pedal vigorously for a few strokes - leave it a minute - pump again and leave it and so on till the pedal was firm and all air expelled - finally top up the tank.
Chris at Octarine Services

Thanks Chris:I've installed a lot of clutch slaves and masters over the last 30 years and I don't remenber ever having to bleed them other then to pump the hell out of them much as you described. Reading this and other threads about clutch bleeding, made me wonder what I was doing right/wrong. RIC
R E L Lloyd

This thread was discussed between 30/01/2004 and 01/02/2004

MG MGB Technical index

This thread is from the archive. The Live MG MGB Technical BBS is active now.