motor may be toast

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Joined
Feb 7, 2012
Threads
48
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267
Location
Marquette, MI
motor may NOT be toast

Well, today was not a good day. Some customer equipment failure resulted in me having to make a 120 mile drive to replace it and of course the only company vehicle wouldn't start due to sub-zero temps. No problem....my cruiser has never let me down. Made the trip, mostly highway miles in bad weather, high winds, slippery roads....which meant I may not have noticed the lack of oil pressure until it was too late. When I got off the highway into town and stopped at a light....I could hear a distinct rotational engine knock. It was very apparent when pulling away from the light. It was then that I see the oil pressure....which oddly was higher at idle than higher rpm.

No idea how long the pressure was low....limped it the mile home. While driving no real lack of power, no smoke, never quit, no CEL, no oil light.....but very bad sounds from the motor.

At this point I'm guessing the motor is toast which is a real bummer since I put considerable work and money into it over the summer and it was driving great. New suspension, all new brakes, new birfs and full front axle rebuild.

I'm going to get it in the garage and check the crank bolt, pull the EFI and check for oil pressure, drain the oil, pull the pan.

The thought of a repair is daunting as I would do it myself and I don't have the $ to pay someone and I've never been inside a motor before. Diesel swap would be nice but likely way over my head.

Any thoughts on this? It is over? Part out time?

Hope your day was better than mine.
 
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id take small steps before declaring the motor dead. I'd say manually check the oil pressure. Also knocking could be something else that the weather could of affected. Could be bad gas, clogged fuel filter, condensation in the distributor causing incomplete combustion. Hope it comes out okay. Keep us up to date.
 
I'm thinking the company should pay to repair it, as it happened on company time :(

Seriously, hoping its an easy repair.
 
Used motors are cheap
 
My research shows that pulling the plug wires one at at time may help determine if its a rod bearing.

What are my chances of just needing a bearing to two? Anyone have success doing this without pulling the motor?
 
My sympathies. If it ran without oil long enough to damage a bearing, there will likely be other damage also. Any idea why the pressure was low? Did you check the oil level? I'd go with a replacement engine if I was in your shoes.
 
Just getting it in the garage...oil level is good. I keep a close eye on it since I have a few drips here and there.
 
I would first put a oil pressure gauge on there as stated above. Have you taken off the crank pulley previously?

A easy way to check for a rod knock is have someone start truck, hold brake pedal, and hit the gas slowly while increasing rpm's. You don't have to go nuts. You can listen with your head in the wheel well or grab a large diamter hose, one end to your ear and other end to the oil pan The load will amplify the knock. It will get louder with rpm.
 
I got a video if it running once I got it in the garage...waiting for my phone to charge and I'll get it posted.

Sounds to me like its coming from the top of the motor.
 
Take a long, large diameter rubber to use as a stethascope and you will be able to tell right where the noise is coming from. If you dont have rubber hose other stuff does work like metal bar (jack handle)
 
Or long handled screwdriver.
 
Doesn't sound like a rod knock to me. What's the oil pressure in the video? Almost sounds to me as if the upper end is not getting oil.
 
Alright....so here is my plan. My neighbor across the street has the most ridiculous garage full of tools. Retired mechanic. He's going to dig out a mechanical oil pressure gauge.....checking actual oil pressure first before I start tearing it apart.

Might be a couple days before I get to it.....ridiculous cold temps.
 
Doesn't sound like the rod knocking I've heard in other cars before. Sounds like something in the upper end.
 

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