Spun Bearing? Good oil pressure.
06-20-2018, 09:46 AM
#1
On The Tree
Thread Starter
Spun Bearing? Good oil pressure. Install new cam and heads. Replaced lifters. On last pull on the dyno, dropped 45HP and had the squeal of a bad bearing. The mechanic says the power lost is what he would expect with a loss cylinder. He did say all cylinders seem to be firing. He said he would think bad lifter if I didnt replace them because the oil pressure wasnt dropping. Rough idle.
Anyone got ideas for me? Im really hoping for something other than a spun bearing but I thinking that is probably likely. Dont want the time down and cost associated with that.
Thanks
Anyone got ideas for me? Im really hoping for something other than a spun bearing but I thinking that is probably likely. Dont want the time down and cost associated with that.
Thanks
06-20-2018, 10:15 AM
#4
I have never seen a motor loose a main or rod bearing and keep oil pressures. You loose a bearing you open a big hole, Then goes oil pressure. You loose a lifter they make noises that will terrify you, If it knocked a wheel off it could be down 45+HP easily. My money is on lifter failure.
06-20-2018, 11:01 AM
#5
On The Tree
Thread Starter
Ok, now you are just trying to give me hope lol. If it was a bad lifter would the cam have to be pull and inspected? Or just replace the lifter and check the cam the next time its pulled apart?
06-20-2018, 11:11 AM
#6
Flip a coin. When they fail I have seen both... Unfortunately no way to know until you get in there. If it was a wheel you are done, Needs a cam no question. If it was a plunger that stuck it is likely OK.
06-20-2018, 11:12 AM
#7
TECH Resident
Thompson is probably correct but if you destroyed a lifter the engine should be opened and cleaned and inspected, you will have metal pieces throughout the oil gallery etc. You gotta pull a head anyway..
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06-20-2018, 11:28 AM
#8
Absolutely correct. If the roller came apart you have a lot of work ahead of you. If the plunger stuck it will make noise but nothing leaves the lifter, cam ect and will likely be OK.
06-20-2018, 02:31 PM
#9
On The Tree
Thread Starter
I just drove it off of the trailer into the garage. No noise, good idle, good oil pressure. Not sure what to do next. Do lifters get stuck then free themselves?
06-20-2018, 02:33 PM
#10
TECH Senior Member
06-20-2018, 03:14 PM
#11
On The Tree
Thread Starter
Or was collapsed then came loose? stronger springs stock replacement lifters. If that is the case then what would be my next plan of action? I assuming if it did it once it will happen again and I would have to replace it.
I going to cut open the oil filter next and see if there is metal in it. If not then... drive it until it happens again i guess?
I going to cut open the oil filter next and see if there is metal in it. If not then... drive it until it happens again i guess?
06-21-2018, 12:03 AM
#14
On The Tree
Thread Starter
Honestly I'm not sure I'm down for it. Im having a hard time justifying spending $5000 more on a car (when running) that's only worth $8000. I'm still paying off the $3000 for the heads and cam. Didnt even get to make one pass with that set up. My current mood is I don't ever want to turn another wrench on this car again.
06-21-2018, 01:00 AM
#15
My advice is to take some time off. It sucks when you spend all sorts of time putting work into something only to have it fail. Take a week, maybe three to get past the pain and mull your options.
I will say this though, a spun bearing isn't the end of the world. It sounds like it hasn't run very long after spinning so it's likely there isn't TOO much carnage. I know it's a fair amount of work but pulling the motor and having the crank polished and new bearings installed is on the low-end of the scale when it comes to cost and amount of work.
If you don't mind me asking, how much power did it make before the bearing failure?
I will say this though, a spun bearing isn't the end of the world. It sounds like it hasn't run very long after spinning so it's likely there isn't TOO much carnage. I know it's a fair amount of work but pulling the motor and having the crank polished and new bearings installed is on the low-end of the scale when it comes to cost and amount of work.
If you don't mind me asking, how much power did it make before the bearing failure?
06-21-2018, 06:37 AM
#16
ModSquad
iTrader: (6)
Wait, what? You drove it into the garage with no noises and good oil pressure, and your filter is full of material?
06-21-2018, 07:31 AM
#18
On The Tree
Thread Starter
My advice is to take some time off. It sucks when you spend all sorts of time putting work into something only to have it fail. Take a week, maybe three to get past the pain and mull your options.
I will say this though, a spun bearing isn't the end of the world. It sounds like it hasn't run very long after spinning so it's likely there isn't TOO much carnage. I know it's a fair amount of work but pulling the motor and having the crank polished and new bearings installed is on the low-end of the scale when it comes to cost and amount of work.
If you don't mind me asking, how much power did it make before the bearing failure?
I will say this though, a spun bearing isn't the end of the world. It sounds like it hasn't run very long after spinning so it's likely there isn't TOO much carnage. I know it's a fair amount of work but pulling the motor and having the crank polished and new bearings installed is on the low-end of the scale when it comes to cost and amount of work.
If you don't mind me asking, how much power did it make before the bearing failure?
On the pull before it dropped HP it was 385 at the wheel. 366tq
06-21-2018, 07:37 AM
#19
On The Tree
Thread Starter
Yes. Although I did cut the filter with a sawsall. I'm going to change the oil and try the process again to make sure the flakes are from the engine and not me cutting it. There was a few flakes in the bottom of the catch pan though. And the oil seemed pretty dark and brown for only being in it for a tune. I'm not feeling too confident in the car or my abilities at this point.