Crankshaft rebuilt on 350
#1
Crankshaft rebuilt on 350
Hello
I need some Help! My 91 350 TPI got a rod bearing demage a few months ago. I decided to rebuilt the engine. Its still running but the sounds very bad. Can I just swap the Crankshaft and the bearings to get it run again?
is that the right crankshaft for the car:
http://www.ebay.com/itm/350-CHEVROLE...48e4c8&vxp=mtr
I am not sure about one piece seal or two piece seal?
Thank you
I need some Help! My 91 350 TPI got a rod bearing demage a few months ago. I decided to rebuilt the engine. Its still running but the sounds very bad. Can I just swap the Crankshaft and the bearings to get it run again?
is that the right crankshaft for the car:
http://www.ebay.com/itm/350-CHEVROLE...48e4c8&vxp=mtr
I am not sure about one piece seal or two piece seal?
Thank you
#2
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Crankshaft rebuilt on 350
If its the org motor your have a 1 piece seal crank.
If you have a rod bearing thats bad, no, it'll have to come apart and the rods will need resized.
If you have a rod bearing thats bad, no, it'll have to come apart and the rods will need resized.
#3
Re: Crankshaft rebuilt on 350
Ok, do I have to take the Engine complete out? or can I swap the crankshaft/Rods from underneath and maybe just lift the engine a few inches?
Are there some nice instructions somewhere?
Are there some nice instructions somewhere?
#4
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Crankshaft rebuilt on 350
Motor will be coming out to fix it.
#5
Re: Crankshaft rebuilt on 350
Does the engine comes out with the transmission? I just read Haynes and I am confused. It says I have to cut the floor pan. is that true and where?
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
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Re: Crankshaft rebuilt on 350
You can take the engine out alone, or with the transmission. There is no cutting involved.
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#8
Re: Crankshaft rebuilt on 350
Good lord cut the floor pan?! Really?
Anyway, theres absolutely no need for that. You can pull the engine out by itself or you can leave the transmission attached. Just be careful to support the transmission as you're pulling the engine out.
Anyway, theres absolutely no need for that. You can pull the engine out by itself or you can leave the transmission attached. Just be careful to support the transmission as you're pulling the engine out.
#9
Re: Crankshaft rebuilt on 350
Thanks for the help it worked out. I have a spun bearing on cylinder 8. the one bearing half was pushed over the other half. The surface on the rod has small scraches and I wounder If it needs to be replaced too since there is a bearing installed over the rod. Can I install a cylinder from underneath? without taking out the cylinder head?
#10
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Car: 1984 TA - 17k orig miles
Engine: 355
Transmission: 700R4
Axle/Gears: 3.44 Dana 44 performance rear
Re: Crankshaft rebuilt on 350
Thanks for the help it worked out. I have a spun bearing on cylinder 8. the one bearing half was pushed over the other half. The surface on the rod has small scraches and I wounder If it needs to be replaced too since there is a bearing installed over the rod. Can I install a cylinder from underneath? without taking out the cylinder head?
The rod needs to be re-sized - since you spun the bearing and the noise you heard was the rod banging up and down on the journal it's stretched the "circle" on the rod and it's no longer a circle - it's an oval - if you simply put new bearings in there you'll end up with too much clearance (usually on the cap end) as the bearing will want to seat against the rod which is no longer the proper size nor the proper shape. The engine will run for a little while to a few thousand miles tops then you'll have the rod knocking again.
To fix it "for good" you'll have to pull the rod out, have a machine shop "re-size" the rod's big end - that's about as cheap as you're going to get away with. Honestly I wouldn't order one of those crankshafts that you linked to earlier - I would simply take the crank you have and at the bare minimum the one rod you have to the machine shop and have them grind the crank and re-size the rod. However if it were me I would pull all 8 pistons and take them in and have all the rods checked as you could be close to having another one out of spec - then get a re-ring kit for the engine and then do a quick de-glaze honing of the bores and re-assemble with new parts and an HV oil pump (since you're not replacing the cam bearings or tightening up the rest of the engine's clearances the HV pump can bandaid excessive clearances for a long time...) The parts shouldn't run more than $200 for everything and about $100 to grind / polish a crank and my guy charges me just for the rods he re-sizes and measures them all for free so maybe another $20 to $150 to get the rods re-sized.
#11
Re: Crankshaft rebuilt on 350
Thanks for the help it worked out. I have a spun bearing on cylinder 8. the one bearing half was pushed over the other half. The surface on the rod has small scraches and I wounder If it needs to be replaced too since there is a bearing installed over the rod. Can I install a cylinder from underneath? without taking out the cylinder head?
Stop trying to cut corners, it will only cost you more money and time in the long run. Consider finding a cheap pullout 305.
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