Team.
I have fitted my BN4 project with a 29D engine that has been subtly upgraded
to a spec that is similar to the BJ8. The engine was fired up for the first
time last weekend and all initial checks seem ok. Unfortunately I have this
afternoon traced what appeared to be an oil leak to a couple of tapped holes
on the generator side of the engine that are open to the crankcase. I don't
know if this is common to all 29D engines but there is a flat mounting face
that would accomodate a mechanical fuel pump in other roles. The two
mounting bolt holes (for a pump) are drilled and tapped but strangely the
square window for the actuating arm doesn't exist - solid casting. Why the
holes were drilled and tapped beats me.
My question is, what thread form would these tapped holes be? It is tricky
to get to see down there and I can't get a 5/16-24 UNF bolt started into the
tapped holes. A 1/4 bolt drops in and hardly touches the sides. It may
just be paint in the threaded holes that is preventing the bolt starting.
My worry is, If I chase this through with a UNF tap only to discover
I should be using 5/16-18 UNC I could wreck the threads.
Paint peelings and perhaps cast iron swarf into the crankcase is a secondary
worry. I wish I'd noticed this while the engine was out of the car.
Thanks.............
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_________________________________________
(______________ Alan Bromfield_______________)
(_______\____1957-BN4____/________)
(__tinyurl.com/healeyforum _)
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