1990 Isuzu Trooper Green o ring

SETH3377

MEMBER
1990 ISUZU TROOPER

Engine Mechanical problem
1990 Isuzu Trooper 4 cyl Four Wheel Drive Manual 0

I purchased a rebuilt engine from a company named Thundrbolt in Houston, Tx. For the vehicle I listed and had an independent mechanic install it. My vehicle never made it out of my mechanics shop because of engine failure, the thrust bearing was broken. After inspection from a Thunderbolt mechanic he determined it was due to a green o ring that is normally used for a/c applications that was used for the oil pick up screen/tube by my mechanic. Hence, as stated by the thunderbolt mechanic, this caused oil pressure drop and the thrust bearing to break off.
My question is regarding that green o ring that was used for the oil pick up screen/tube, is it only used for a/c applications, will it deteriorate with oil contact and/or be affected in any other way by being used in this particular application and cause oil pressure drop and a thrust bearing to break off. Of note is that this vehicle had never been driven out of the mechanics shop.
I would greatly appreciate your help in this matter as I have already spent 2,200 dollars paying thunderbolt and my mechanic and I'm in a jam with a meager teachers aide salary and am being bounced back and forth between mechanics with no one accepting responsibility.

Thank you.

3 Replies

RACEFAN966

MECHANIC
5,029 POSTS

Ok green orings are mostly used in A/C and fuel. Now to answer your question the green oring would not have just deteriate it would have taken some time for that. Now my question is who droped the engine on its end or hit it with a hammer on the end of the crank? See you say it was a thrust bearing that broke correct? This don't brake from a drop in oil pressure also what did the cam and main bearing look like? If you don't know ask Thunderbolt. See the thrust is a bearing that keeps the crank from moving front to back so it the engine was either dropped on one end or the other or more likely the mechanic used a hammer to install the harmonic balancer on the front of the engine, as a builder of performance engine that is most likely way for a thrust to just break as it would have worn if it was lack of oil pressure.

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Tuesday, June 29th, 2010 AT 11:21 AM

SETH3377

MEMBER
2 POSTS

Thanks for your quick response, there was a new clutch installed that also went bad and made loud noises when clutch was pressed down and it had to be changed, however, this was before engine lost oil pressure and started making it's own loud noises and went bad. Could it be that the clutch was also affected by whatever caused the thrust bearing to go bad, you know because crank was pressured too much, then this could've also caused the new clutch to go bad as it too had more pressure applied by the crank, then when the other new clutch was installed it caused the thrust bearing to finally break off? In other words, the crank had pressure applied on the other end by hammer, etc, and this caused new clutch to receive initial impact and weakened it causing it to break, then when the other new clutch was installed it caused "fresh" pressure applied to crank and finally caused the already weakened thrust bearing to break as well. What do you think?
Also a bit more on the o ring, if the green o ring used was too small or positioned wrong on the oil screen/tube pick up would that cause the thrust bearing to break because of no oil pressure? I know you answered that to a point already but I just need to know if an undersized o ring and badly positioned o ring would cause the thrust bearing to break.

Thank you much, I greatly appreciate your help

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Tuesday, June 29th, 2010 AT 1:09 PM

RACEFAN966

MECHANIC
5,029 POSTS

First on the o'ring I do not think this caused the thrust to break it would cause it to wear with the other bearings and the cam bearings would suffer the most damage in that case. Now the thrust breaking caused the oil pressure to drop. Now as for the clutch I don't think that had anything to with it as the clutch don't cause pressure to the crank in that way unless you are at a dead stop and drop the clutch with the engine at a high RPM (like trying to do a burn out). I think the harmonic balancer was installed with a hammer this cracked the thrust and soon after caused the failure of the thrust.

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Wednesday, June 30th, 2010 AT 10:50 AM