4.6 2v assembled incorrectly by MS

[Rolltide1006]

Hey all. Had my shortblock forged a year ago and been driving it for that long too. Well last weekend I heard a knocking sound. Heard it was coming from the motor and dropped the next day. I never lost oil pressure, motor was primed before first start, new oil pump was installed, always full on oil and changed regularly. Well this is what I found. Cylinders 1 and 5’s connecting rods are installed backwards and the bearings are riding on the crank fillets. The bearing on cylinder 1’s connecting rod wasn’t installed properly either. Monday can’t get here quick enough.

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[Three21]

Ouch. I hope they do something for you, but after a year be ready for some hassles.

Interesting that it lasted so long without showing signs sooner. Never any excessive noise once warm? Or trash in your oil?

 

[Curt@injected]

Damn dude. Sorry to see that. Hopefully they make it right but I would be prepared for a fight. Between the time and you taking it apart yourself they may be a pita.

 

[Rolltide1006]

Ouch. I hope they do something for you, but after a year be ready for some hassles.

Interesting that it lasted so long without showing signs sooner. Never any excessive noise once warm? Or trash in your oil?

Didnt notice any trash and didn’t hear anything until it started knocking on cold start and at 2-3k rpm. Taking it to the machine shop tomorrow. They claim to have never seen rods installed backwards.


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[Rolltide1006]

Damn dude. Sorry to see that. Hopefully they make it right but I would be prepared for a fight. Between the time and you taking it apart yourself they may be a pita.

Ya it’s a mess. I had this engine tuned at injected haha. Made 272 hp amd 304 trq. I am amazed it lasted a year.


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[Curt@injected]

Yep I remember.

 

[Rolltide1006]

Yep I remember.

Automotive Precision Machinery is who built it. They wouldn’t look at it this morning. I asked if they could take the pan and other caps off and they said they didnt have ths time. So I took it to Bishop Machine Shop in Mableton. There we took the pan off and other caps. He said all the rods were backwards, but only #1 spun. They said they could strip it down, clean me up, machine the crank and would be good to go.


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[Curt@injected]

Wow. Well glad it isn't too bad.

 

[Rolltide1006]

Wow. Well glad it isn't too bad.

We will see what happens when I fire it up lol. Fingers crossed. I wonder how much power I lost from this. 5-10 hp/trq, maybe?


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[Three21]

Good to hear they think it'll clean.

After they get it back together ask them what the rod side clearance is (between the rods or rod to crank shoulder) should around 0.010 in. I believe spec is 0.005in to 0.019in max. My only concern would be with losing material from where the rods were contacting each other or the crank shoulders.

 

[Rolltide1006]

Good to hear they think it'll clean.

After they get it back together ask them what the rod side clearance is (between the rods or rod to crank shoulder) should around 0.010 in. I believe spec is 0.005in to 0.019in max. My only concern would be with losing material from where the rods were contacting each other or the crank shoulders.

For sure. I will ask tomorrow


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[Rolltide1006]

Finally up and running again



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[BMAC96GT]

Thats a shame. Hard to find someone you trust with your motor these days. Glad to see it back together. Sounds great