NEED HELP AND ADVISE

[landlocked4now1]

I need help and advise.....my motor was damaged by freezing last winter....I hired a shop too reman the motor....I bought a new block, pistons, and rings, and a remaned crankshaft that was "ten" under(there was rust on the original crank) all was well, the motor started and ran great, it made a little smoke but i took that as the rings seating......all was well until about 5 hours into the break in......the motor started to have a "knock".....i checked the oil rite away and it went from the new oil look to a light grey or dirty look.......I called the guys that remaned the motor and they thought it sounded like a main bearing knock.......I thought the same thing.......what i need advise on is after spending mogo dollars on having this thing remaned......they said it sounded like it needed a "bottom overhaul" ie regrinding the crank and installing new bearings, and they would do that for free.......what i need to know is this ok to do.....or do they need to totally tear down the motor due to it "making metal" when the bearings failed......also what would make the bearings fail so soon.....i dont know the brand of bearings they used and i have looked here on the internet and find that "clevite 77" seem to be a recomended bearing for high perf engines......should i insist on them using those bearings or is there something out there that would be better.......the motor is a 2000 volvo 4.3 gl

 

[Bt Doctur]

Re: NEED HELP AND ADVISE

Was the motor "pre-oiled" before the initial start up?
If not, may be a bearing failure from lack of oil

 

[Dunaruna]

Re: NEED HELP AND ADVISE

[colour=blue]Hi LL, welcome to iboats!!

You said that you already had a remaned crank - done by a shop. That IS a "bottom overhaul".

Bearings fail because they are (usually) not dailed in correctly, or the oil pressure is way too low, or the crank wasn't finished properly etc..........................

Are they wearing this as a warranty?

 

[landlocked4now1]

Re: NEED HELP AND ADVISE

Was the motor "pre-oiled" before the initial start up?
If not, may be a bearing failure from lack of oil

yes the motor was pre oiled.....when i first started it the oil pressure went rite to 40 psi and held steady......

 

[landlocked4now1]

Re: NEED HELP AND ADVISE

[colour=blue]Hi LL, welcome to iboats!!

You said that you already had a remaned crank - done by a shop. That IS a "bottom overhaul".

Bearings fail because they are (usually) not dailed in correctly, or the oil pressure is way too low, or the crank wasn't finished properly etc..........................

Are they wearing this as a warranty?

yes i guess they are going to do the "bottom overhaul" as warranty.....my biggest question is do they have to totally disassemble the motor and clean it from the "METAL" that it made when the bearing failed, and are there any other things i should watch out for or ask them....thanks

 

[speedholes]

Re: NEED HELP AND ADVISE

I wouldn't think it was a pre-oil problem. With propor amounts of assembly lube, it should be able to run for a bit before damage occurs. In HS auto shop, a guy forgot to make sure he had everything right, and ran a newly rebuilt 302 for like 2 minutes without oil with no damage.

The assembly lube washing off will cause your oil to look greyish, and it should look like this. Did you change the oil filter RIGHT after the initial startup? If not, some oil filters have a bypass in them that will allow oil through the filter if the media is clogged. Could have clogged, then let metal shavings past and into the oil circ. system. I would ask them what they thought caused the bottom end failure, and have them look under the valve covers for any unusual wear.

 

[Reel Poor]

Re: NEED HELP AND ADVISE

If it's knocking, there is metal in the oil. The only way to get all the metal out is a complete disassembly, thorough cleaning of all parts (including heads), installing all new bearings, replace/repair damaged rod/rods, and replace oil pump. In reality anything short of a shortblock rebuild is virtually a patch job and will only come back to bite you in the ........

 

[landlocked4now1]

Re: NEED HELP AND ADVISE

I wouldn't think it was a pre-oil problem. With propor amounts of assembly lube, it should be able to run for a bit before damage occurs. In HS auto shop, a guy forgot to make sure he had everything right, and ran a newly rebuilt 302 for like 2 minutes without oil with no damage.

The assembly lube washing off will cause your oil to look greyish, and it should look like this. Did you change the oil filter RIGHT after the initial startup? If not, some oil filters have a bypass in them that will allow oil through the filter if the media is clogged. Could have clogged, then let metal shavings past and into the oil circ. system. I would ask them what they thought caused the bottom end failure, and have them look under the valve covers for any unusual wear.

i guess i dont think its a pre oil problem.......the motor ran fine for about 5 hours......then the knock......anyway......will it work if they just do a "bottom overhaul" ie new rod and main bearings after they grind the crank.....any help would be appreciated......ie would any long term damage come from just doing that or would a total dismantle and cleaning be needed.....thanks

 

[Bt Doctur]

Re: NEED HELP AND ADVISE

"pre-oiling" is installing a shaft where the dist. would go and spining the oil pump to prime all the parts of a motor.this removes any air pockets in the gallery and mains and rods regardless of assembly lube.Should be done untill you see oil coming out of the push rods onto the rockers.a dry bearing will gall and spin on start-up leading to failure.

 

[landlocked4now1]

Re: NEED HELP AND ADVISE

I just talked to the shop and they said that a total dismantle and cleaning is not needed.....is that true.....they say because the motor has such low hours on the rebuild and i caught the knock quick.....that they will clean the pan, and the bottom end of the motor intall the new rod and main bearings change the oil filter, run it for a while in the shop, change the oil and oil filter and it will be good to go.......they even said it may not need the crank ground if it looks good.....am i being taken by these guys or should i insist on a total dismantle, crank grind etc......

 

[Bondo]

Re: NEED HELP AND ADVISE

At This Point,......... Your Mechanic is in Risk Management.......

He's doing the work,....... And Paying for it..........

The Odds are his plan will work,+ your motor will live another 1000hrs............

I'd be more worried about finding out WHY it Puked in the 1st place, then telling your man that Now he Has to do things Your Way..............

He's Going Good for the Repairs,...................Let him Do his Job..............

 

[landlocked4now1]

Re: NEED HELP AND ADVISE

thanks bond-o.......one last question......can the crank be used again with new bearings or should it be ground again after the bearing failure.....thanks again

 

[landlocked4now1]

Re: NEED HELP AND ADVISE

sorry one last question are all bearings equal for a marine application.....i will happily pay for a better one if there is one.....i mentioned before that it seems like clevite 77 is used for racing and high rpm engines are these what i should go with or is there something else that is better?????

 

[Bondo]

Re: NEED HELP AND ADVISE

Next to the last Question,..........
Without actually Seeing the Crankshaft Journal,.......
That's an Unanswerable Question.......
But,....
Ayuh,.... It's Very Possible that the Crankshaft is Fine.......

Last Question,............

Most Bearings are well up to the task,........

If you Insist on a Better Bearing,....... Clevite Is known for their Quality......

Your Mechanic, or Machinest should be able to get some Quality Bearings in Whatever undersize they Need........

Like I Said,........ Let the guy Do his Job........