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91
Electrical Items / 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
92
Electrical Items / 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 youíre looking over the fender):
Top    Red/Green
Two    Blank
Three White
Four   Brown

Rear side (left side as youíre 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
93
Electrical Items / 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
94
B roadsters rubber-bumpered ('75 to '80) / 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 Ė 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
95
B roadsters rubber-bumpered ('75 to '80) / Air Valve Piston Orientation
« Last post by june2021 on April 24, 2021, 11:34:34 AM »
I have cleaned and am rebuilding a Zenith Carb on my 1976 MGB (many parts damaged before I bought the car).. 

Everything is going well but I have one question:

When I reinstall the air valve piston, how should it be oriented (the two bottom holes toward the intake, toward the engine, or one on each side)?  I donít want to rely on how the butcher assembled it and I havenít found a video that helps with that.

Thank you so much!
Larry Jones
96
Electrical Items / Re: Third Fuse Not Live
« Last post by JohnTwist on April 24, 2021, 11:47:59 AM »
Two problems.  Wonít 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 Ė BROWN always hot; BLACK always earth.  If those check out itís 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 youíre 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
97
Electrical Items / Third Fuse Not Live
« Last post by june2021 on April 24, 2021, 11:33:20 AM »
I need your guidance on an issue I'm having with my '78 MGB.  It has a Pertronix and Weber carb.  When I go try to start the car I have nothing (turning the key in the ignition), I do hear the fuel pump and have lights.

So far to date- I've cleaned all battery connections, checked battery (tested good), and I'm able to start the car by taking the (brown/white) wire from starter relay and put it on bottom row of fuse block- car starts/ runs as normal when I do this.

Lastly, I used my test light on the third row fuse block when key is turned on in ignition and I have nothing.
Thoughts on next step to troubleshoot? Starter solenoid? Ignition switch?  I would appreciate any help.  Thank you.

Mark Younkin
Glasgow, KY
98
Engine Related Items / 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
99
Engine Related Items / 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
100
Questions and Answers / Re: Steering Wheel Replacement
« Last post by amgba on April 24, 2021, 11:52:31 AM »
Try not to rock the steering wheel side to side when you remove it. The hub which the wheel is attached to is made of aluminum and the splines can widen over time causing a poor fit. If it doesn't come off easily, get a puller. Autozone and the like will lend you one for no cost.

David Bigelow
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