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71
General Discussion / Re: Gas Tank Leaks
« Last post by amgba on April 24, 2021, 11:51:12 AM »
After having the fuel tank sealed you reinstalled the sender with new sealing gasket? Were you able to drive the metal sealing ring all the way round to the stop? Any problems with this install?

The last time I did this I think I had a small leak until I tapped the ring fully home using a brass drift.

Cliff Maddox
72
General Discussion / Re: Third Fuse Not Live
« Last post by JohnTwist on April 24, 2021, 11:47:59 AM »
Two problems.  Won’t start and third fuse is not live.

WHITE/RED should illuminate your test light when the key is turned to START.  If so, check the other wires – BROWN always hot; BLACK always earth.  If those check out it’s the relay (odd).

If the WHITE/RED does NOT illuminate the test light, then go back to the loom / connection between the key switch and the wiring harness.  Check it there, under the steering column.

The WHITE circuit is alive since the engine will start, but perhaps the ignition relay (in front of the fuse box) is faulty (not odd).  WHITE hot with ignition on; BROWN always hot; BLACK always earth; WHITE/BROWN feed to the fuse box.
Call me if you’re still having problems.

SAFETY FAST!
John H Twist
University Motors Online
100 East Beltline Avenue SE
Grand Rapids MI 49506-2410
Cell:  616-307 6737
www.universitymotorsltd.com
73
General Discussion / Re: Air Valve Piston Orientation
« Last post by JohnTwist on April 24, 2021, 11:47:03 AM »
There are little tabs on the rubber diaphragm – one on the inside diameter and one on the outside diameter.  These fit into slots in the air piston and the carb body.  Correctly placed, they ensure that the two air holes are closest to the ENGINE. 

Hope this helps.

SAFETY FAST!
John H Twist
University Motors Online
100 East Beltline Avenue SE
Grand Rapids MI 49506-2410
Cell: 616-307-6737
www.universitymotorsltd.com
74
General Discussion / Re: Headlight Switch
« Last post by JohnTwist on April 24, 2021, 11:45:16 AM »
It might be as simple as faulty fuse box wiring.  This is the way the fuse box SHOULD be:

Forward side (right side as you’re looking over the fender):
Top    Red/Green
Two    Blank
Three White
Four   Brown

Rear side (left side as you’re looking over the fender):
Top    Red pair
Two    Red pair
Three Several greens, perhaps paired
Four   Purple

If you have other wire colors or homemade wiring on the fusebox, send me a picture.

Hope this helps!

SAFETY FAST!
John H Twist
University Motors Online
100 East Beltline Avenue SE
Grand Rapids MI 49506-2410
Cell: 616-307-6737
www.universitymotorsltd.com
75
General Discussion / Re: Spark Plug Recommendation
« Last post by JohnTwist on April 24, 2021, 11:44:26 AM »
I would use Champion RN9YC plugs (#415) gapped at 0.035”  My experience with platinum plugs has not always been optimal.

Hope this helps.

SAFETY FAST!
John H Twist
University Motors Online
100 East Beltline Avenue SE
Grand Rapids MI 49506-2410
Cell  616 307 6737
www.universitymotorsltd.com
76
General Discussion / Re: Coil Springs Height
« Last post by JohnTwist on April 24, 2021, 11:43:46 AM »
The height of the car, from the ground to the bottom of the chrome strip, should be equal – the same on all four corners.  A variation of ½” is not worrisome or noticeable.

It’s not uncommon to purchase new rear springs that are too stiff which will hold the back end too high.
The front coil springs change several times throughout production years AND between the roadster and the GT. 
The only real difficultly in refitting your old springs is removing the anti-sway bar link from the A Arm and spring pan. 

Your suspension is basically the same as a 1950 TD and a 1980 MGB and many of the components remain the same though out those years and models!

The crossmember is the same between the GT and roadster.  A rubber bumper crossmember is very different from the earlier ones and would set the front of your MGB perhaps two inches higher

New coil springs are relatively inexpensive and the quality is OK.

Hope this helps a bit!  If you’ve got a further question, just call me.

SAFETY FAST!
John H Twist
University Motors Online
100 East Beltline Avenue SE
Grand Rapids MI 49506-2410
Cell  616 307 6737
www.universitymotorsltd.com
77
General Discussion / Coil Springs Height
« Last post by june2021 on April 24, 2021, 11:40:40 AM »
I am somewhat new to the hobby of British Cars, so my knowledge is limited.  I have been watching your YouTube videos for several years and actually met you last year when you visited the South Alabama British Car Club.  I have a question I am hoping you could help me with.  I re-built the front suspension on a 71 MGB-GT.  I cleaned everything and replaced all the bushing and washers and also replaced some worn out components, include the suspension frame. 

Everything went back together beautifully and functions as it should.  But …. I used parts from the front end of a roadster (not sure if it was a rubber or chrome bumper car).  All of the parts looked identical to the ones I was replacing, so I felt comfortable using them. 

My question is regarding the coil springs.  I used the nice looking springs from the Roadster.  But now my front is sitting low.  So I am wondering if the coil springs are different between a roadster and a GT.  If they are different, is that why the front of my car is low?  (Or could it be the front suspension frame?)  Is the suspension frame different between a roadster and a GT?  I used the frame from the Roadster on the GT.

I would appreciate any advice you could give me.  I have asked members in the club and have gotten different answers. 
Ben Cummings
78
General Discussion / Gas Tank Leaks
« Last post by june2021 on April 24, 2021, 11:37:47 AM »
I had the gas tank on my MGB cleaned and coated with epoxy. Now I can't get the sending unit to seal. 

Does anyone no a trick to stop it from leaking.  I replaced the gasket but that did not help.

Richard O'Connor
79
General Discussion / Spark Plug Recommendation
« Last post by june2021 on April 24, 2021, 11:37:09 AM »
Is it OK to use single or double platinum plugs in a 1979 MGB?  I am currently using Autolite 64, which solved a misfiring problem some years ago with the 63 plugs. 

Your recommendation appreciated. Thanks.

Rudi
80
General Discussion / Headlight Switch
« Last post by june2021 on April 24, 2021, 11:36:14 AM »
This may be a long shot, but I inherited a 1975 MGB. Could you give me some possible solutions for a problem I am having?

Anytime I turn on the headlight switch, the fuel pump and ignition system are activated. So after starting the car, if I turn the headlights on, and then turn the key completely off and remove it, the car will run until I shut off the light switch.

Have any suggestions?
Troy Spang
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