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283 engine problems

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zpatton
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283 engine problems

Post by zpatton » Mon Aug 06, 2012 11:47 pm

i've recently rebuilt a 283 chevy engine for a 1968 corsair sea v inbord. problem is there is ALOT of smoke coming from the exhaust pipes and from the oil filler tube any suggestions on how to fix it?

jfrprops
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Post by jfrprops » Tue Aug 07, 2012 9:58 am

Sounds like a rebuild based on just the evidence you outlined.
blow out and blow past.
John in Va.
1980 Fairchild Scout 30
19?? custom Argentine Runabout 16'
1954 Whirlwind deluxe dual ckpt 16'
1921 Old Town Charles River 17' (founding Captain, James River Batteau Festival)

zpatton
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Post by zpatton » Tue Aug 07, 2012 1:05 pm

ok so how do i fix it? seems like the carb losses all the vacuum when more throttle is used is that normal for that engine?

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drrot
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Post by drrot » Tue Aug 07, 2012 1:05 pm

Did they use Chrome piston rings?
Jim Staib
www.finewoodboats.com


1947 Penn Yan 12' Cartopper WXH474611
1950 Chris-Craft 22' Sportsman U-22-1532
1957 Chris-Craft 26' Sea Skiff SK-26-515
1968 Century 17' Resorter FG-68-174

jfrprops
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Post by jfrprops » Tue Aug 07, 2012 2:56 pm

I am afraid the fix is to pull it out and send it to the machine shop for test and rebuild...if it is as bad as you indicate. Jim asked a good question too....chrome rings?

John in Va.
1980 Fairchild Scout 30
19?? custom Argentine Runabout 16'
1954 Whirlwind deluxe dual ckpt 16'
1921 Old Town Charles River 17' (founding Captain, James River Batteau Festival)

zpatton
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Post by zpatton » Tue Aug 07, 2012 4:05 pm

no chrome rings. and it was rebuilt by a mechanic about two weeks ago the carb was the only thing left untouched. it has been sitting for a couple years and we are starting to restore it. first thing was the engine and its been a headache

jim g
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Post by jim g » Tue Aug 07, 2012 5:32 pm

Make sure you use break in oil for the first 20 hours or so. The rings will not seat in if you use regular oil from the parts store. see link

http://www.penngrade1.com/Products/High ... n-Oil.aspx

zpatton
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Post by zpatton » Tue Aug 07, 2012 6:32 pm

thanks jim g i'll check and see what oil they used to fill it up after they rebuilt it if its regular oil ill empty it and put some break in oil back in it

jfrprops
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Post by jfrprops » Tue Aug 07, 2012 6:46 pm

Good on the break in oil....did not understand that this engine had already been rebuilt...that of course changes everything...maybe this is just breakin smoke...?

John in Va.
1980 Fairchild Scout 30
19?? custom Argentine Runabout 16'
1954 Whirlwind deluxe dual ckpt 16'
1921 Old Town Charles River 17' (founding Captain, James River Batteau Festival)

jim g
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Post by jim g » Tue Aug 07, 2012 7:15 pm

Did the rebuilder use new pistons or did they knurl the old pistons to take up for the wear. Was the engine overheated on the first running of it? If so this will glaze the cylinder walls.

zpatton
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Post by zpatton » Wed Aug 08, 2012 8:16 pm

engine was not overheated the first running. we reused the old pistons because it turns out they were industrial pistons which to my understanding just means there is a harder metal before the first ring that has a higher resistance to wear. so they cleaned the pistons up and put them back in with new rings. if the cylinder wall is glazed over is there any way to fix that problem without completely tearing down the engine again?

Peter M Jardine
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Post by Peter M Jardine » Thu Aug 09, 2012 8:55 am

I'm not sure about the exhaust smoke, but check the intake manifold under the baffle.... they rot through under the steel cover, and blow exhaust fumes through the oil gallery. If you have a 283F, this is a common problem.

Jim Bell
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Post by Jim Bell » Thu Aug 09, 2012 9:54 am

Did the rebuilder check cylinder taper? Most rebuilds include a rebore to 20 thousand over that would require new pistons. Usually when rings need replacement a rebore is in order. At that point, I would consider a short or long block. IMHO. :?:

jim g
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Post by jim g » Thu Aug 09, 2012 1:26 pm

do you know how many hours were on the engine before it was rebuilt?

zpatton
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Post by zpatton » Thu Aug 09, 2012 3:11 pm

not sure on the hours before the rebuild. will check the intake manifold as soon as i can. and there was no rebore it didnt need it the rings were replaced because they wouldnt uncompress from the piston properly possibly from age of the rings or a past overheat.

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Paul P
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Post by Paul P » Mon Aug 13, 2012 1:17 pm

Peter M Jardine wrote:I'm not sure about the exhaust smoke, but check the intake manifold under the baffle.... they rot through under the steel cover, and blow exhaust fumes through the oil gallery. If you have a 283F, this is a common problem.
I agree with Peter on this one. If you put your hand over the filler tube while the motor is running and it is building up considerable pressure quickly, I would bet the intake manifold has a rust pinhole in the exhaust crossover and it is pressurizing the crankcase. Good luck!

Paul
1956 17' CC Sportsman, 300-hp
1957 17' CC Sportsman, 95-hp
1966 20' CC fiberglass Sea Skiff, 210-hp+
1973 23' CC Lancer inboard project, 427/375-hp.
1966 38' CC Commander Express, 427/300-hp(2)

So many boats.........so little time.....but what a way to go!!

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