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 Engine knock

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whchman
Newbie


Name : J D
Joined : 2012-04-27
Post Count : 2
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Engine knock Empty
PostSubject: Engine knock   Engine knock EmptyMon Jul 16, 2012 9:05 pm

1995 Buick Riviera Series One SC 100k miles.
Hello Riv owners,
After some spirited track driving my 3800 has a knock that seems to becoming from the lower end of the engine. Found no metal in the oil and valve train is noit broken (springs and such). My question is:

! Can the crank shaft be removed and replaced while the engine is still in the chassis ?

2 Has anone ever done this repair this way.

I still have to diagnose the problem further but wanted to get an idea about not having to pull the entire drive due to limited tools to do so. This car has recently had all new Plugs,wires and lower intake gaskets, rebuilt AC ayatem tires and exhaust. I did already remove the SC belt and ran the engine breifly to role out a bad super charger.
Any help would be great

Thanks JD
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AA
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AA

Name : Aaron
Age : 42
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18370
Merit : 241

Engine knock Empty
PostSubject: Re: Engine knock   Engine knock EmptyMon Jul 16, 2012 11:27 pm

It's going to be difficult to diagnose for sure without pulling the engine, unless you have a experienced mechanic listen to the sound. A deep knock coming from the bottom end suggests a rod bearing failure. I did the same thing at the track a couple months ago. In my case I also had a chipped piston. A compression test can tell you if your pistons and valves are in good shape.

You should be able to replace the bearings from the bottom, but if you find the crank or rod is damaged, then you could be stuck. Removing the crank from the bottom would be difficult. Might as well pull the engine from the top to make it easier. You don't need to pull the entire drive-train, transmission can stay in the car. Maybe someone has pulled the crank from the bottom can give some advice.

Good luck, and if you have any pics/vids of your track day, we'd like to see them!

_________________
'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO • 85k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26
Because fun


'70 Olds Ninety-Eight Holiday Coupe • 116k miles • 455 Rocket V8
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'95 Celica • 152k miles • 0-60: yes
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whchman
Newbie


Name : J D
Joined : 2012-04-27
Post Count : 2
Merit : 0

Engine knock Empty
PostSubject: Engine Knock   Engine knock EmptyTue Jul 17, 2012 12:52 am

Thanks AA, Compression test is next. I may just go ahead and yank it out this winter and make a project out of it. started as a buget build for a play toy but I have fallen in love with driving this car. Still want to drive it this summer but my time is limited and projects are many. Im waiting on some pics from a friend. Shows me stompin an oversize muffler with Honda stickers on it LOL Ya gotta Pay to Play

JD
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Engine knock Empty
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