Tension is by pulling the belt taut with a bar on the generator (standard procedure with alts/gens back in the day). Bad generator bearing changing tension on belt with each revolution - you’d notice a wobble just turning over the engine though???!
Bad bearing or pulley at crankshaft? Any problem/front main seal?
Bad pulley/bearing at water pump?
9.5mm X 750mm and 9.5mm X 900mm fan belts for 68 MGB though later listings show 10 mm width. Belt should ride on pulley shoulders and not bottom out.
Were any of the pulleys changed out over time? There are some differences in the pulley dimensions / geometry of the groove. Amazingly, not well documented:eek:.
The alignment looked good the last time I looked at it. I’ll have to look again. One thing that occurred to me is that on an airplane or helicopter, there should be about a half-inch of play in the alternator belt. I think it would be the same for the generator/fan belt on an old car. I’ll have to check that too.
As for the rest of the engine, it was professionally rebuilt (at a race shop). Despite its appearance after being in Rainland’s climate, it’s basically brand new.
This is getting a bit off-topic, since I’m still looking for an ‘unbreakable’ fan belt, but…
I talked to Bob at Brit Tech about the stalling-when-hot problem. I sent him some photos of the (Lucas Gold) coil and the distributor. Might be the coil, though he said the Gold should work with the Pertronix ignition, or it could be the Pertronix module. He says it’s an unusual problem; with Pertronix it either works or it doesn’t. I’ve sent him pics of the coil and distributor.
Additional: Talked to Bob again. He said that I should let the car idle a while. When it quits, feel the coil. If it’s too hot to touch, then the coil needs to be replaced. If it’s just very warm, then it’s probably good and I should call Pertronix.