hi guys,well just when you think you've seen everything something pops-up.helped a pal get his big block started today and ran into starter problems.this engine was a running engine in front of a turbo 400,from the casting #'s it is a 78-80 454,so the block is drilled with 3 starter mounting holes,the starter is a delco cast iron nose offset bolt holes. the bellhousing is a 621 housing for the large flywheel and the casting # on the flywheel is 3973457. cant seem to find that # in all my info,but if the 7 was really a 9 it comes up as a 454 wheel.what is happing is the bendix will not engage the ring gear! after trying 2 other starters i removed the solenoid and pushed the drive by hand and it misses the ring gear by about 7/16 of an inch. later in the day i found out that the guy he got the flywheel says that it is from a 78 pickup. i have been doing this for over 35 years and i'm out of ideas. the step on the flywheel that seats the ring gear looks like is spaced wrong to mate the bendix gear,am i missing something?could the stop on the armature for the drive gear be further down the shaft? thanks as always.
starter not engaging
magicrat56
1 - 9 of 9 Posts
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1,946 Posts
hi guys,well just when you think you've seen everything something pops-up.helped a pal get his big block started today and ran into starter problems.this engine was a running engine in front of a turbo 400,from the casting #'s it is a 78-80 454,so the block is drilled with 3 starter mounting holes,the starter is a delco cast iron nose offset bolt holes. the bellhousing is a 621 housing for the large flywheel and the casting # on the flywheel is 3973457. cant seem to find that # in all my info,but if the 7 was really a 9 it comes up as a 454 wheel.what is happing is the bendix will not engage the ring gear! after trying 2 other starters i removed the solenoid and pushed the drive by hand and it misses the ring gear by about 7/16 of an inch. later in the day i found out that the guy he got the flywheel says that it is from a 78 pickup. i have been doing this for over 35 years and i'm out of ideas. the step on the flywheel that seats the ring gear looks like is spaced wrong to mate the bendix gear,am i missing something?could the stop on the armature for the drive gear be further down the shaft? thanks as always.
Joined
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1,946 Posts
thanks verle,but the bendix gear wont touch the ring gear in the depth of its throw not side to side. its a 454 flywheel but its coming apart this weekend.thanks for your reply.
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1,946 Posts
problem over guys, ordered new hays flywheel. the ring gear is at the very edge , towards the block,just the way its supposed to be! its possible that this used flywheel is not from a 3500 series pick-up but a 50 or 60 series, pretty sure they had a bellhousing mounted starter. thanks to all the guys that replied and just go's to show us all about used parts.i wasn't there but when a seller asks you what own before telling you what they are selling, walk away.
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1,946 Posts
flywheel swap done, the problem with the used wheel is that it has 2 steps to mount the ring gear,one towards the block side,where it needs to be or the inner step towards the clutch. could have saved money by swaping ringgear to inner spot,but would rather drop it on sellers foot.watch out for #3973457 wheels.
1 - 9 of 9 Posts
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