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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Feb-14-2018, 12:36:30 AM   #1
Mike_M
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Default Engine with spun rod bearing. What to do?

So I over rev'd my engine and spun a rod bearing.

I have sourced a used engine with labor and half the miles of my car at a decent price.

What could I get for the engine with the spun bearing? 140k miles. Lots of maintenance before this problem occurred.

What's the best line of action? Should I put a new used engine in or fix my current one?
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Old Wed, Feb-14-2018, 12:56:22 AM   #2
cloizou
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Default Re: Engine with spun rod bearing. What to do?

Sorry to hear your loss! I had a similar issue before. I would recommend putting the used motor in, you will save a lot of time and money. While the motor is out, do the rod bearings, cpv gasket, any transmission work (clutch etc.) and headers if you want.

As for resale, you can part out pieces and make a decent amount back. Accessories, head, oil sump, exhaust and intake manifolds.

Good luck!
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Old Wed, Feb-14-2018, 01:02:10 AM   #3
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Default Re: Engine with spun rod bearing. What to do?

You would have to asses the damages on your existing motor to have a decent idea of what it would be worth.
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Old Wed, Feb-14-2018, 01:15:00 AM   #4
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Default Re: Engine with spun rod bearing. What to do?

In my experience most people go the used engine route as it's a simpler and less labor intensive.

If you go that route definitely do 1) rod bearings 2) vanos/valve adj and 3) cpv etc on the used engine prior to install.

The only potential downside of getting a used motor is you might not always know what you're getting. I've seen people get a cracked block or really filthy motors.

If you want to reuse your motor, you will need to essentially rebuild it which involves full disassembly. You will need to figure what to do with the crank (regrind or replace) since it will most likely be damaged. You will likely need to replace the rods or at least the one that spun. You will also need to flush oil filter housing, cooler, lines etc for debris. More work but you know what you're getting though.

Out of curiosity how high did you see your tach go?
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Old Wed, Feb-14-2018, 04:20:57 AM   #5
Mike_M
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Default Re: Engine with spun rod bearing. What to do?

Yea that’s what I was fearful of as I know how well I took care of my engine.

But wouldn’t the benefit of rebuilding be that there’s a ton of new parts? Would it be about the same cost as a used one?

I got quoted about $4k for an engine with 68k miles installed.
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Old Wed, Feb-14-2018, 04:46:14 AM   #6
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Default Re: Engine with spun rod bearing. What to do?

That is a fantastic price including labor for a 68k mile engine. I'd be concerned with the quality of work you get at that price an be looking out for any hidden costs.
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Old Wed, Feb-14-2018, 04:48:16 AM   #7
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Default Re: Engine with spun rod bearing. What to do?

I'm not at all an expert in this, but I see you're in San Diego as well, so it may be worth giving Lang Racing up in Irvine a call. Based on my (albeit limited) knowledge, if you are going to try and salvage the engine, they'd likely be the best place to start. I believe I saw a thread before where Andrew Lang (owner and namesake) talked about the procedures they have to save engines that have had catastrophic bearing failures, and I definitely know they regrind damaged crankshafts and rebuild engines.

If you are worried about the prospects of a used motor, this may be something to consider.
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Old Wed, Feb-14-2018, 05:05:19 AM   #8
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Default Re: Engine with spun rod bearing. What to do?

Quote:
Originally Posted by Mike_M View Post
But wouldn’t the benefit of rebuilding be that there’s a ton of new parts? Would it be about the same cost as a used one?
$4k installed is a smoking deal for an S54. Even at normal prices the used engine will probably be the more economical route. Have you torn down the blown engine? There are probably bent valves too from the overrev.
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Old Wed, Feb-14-2018, 05:06:37 AM   #9
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Default Re: Engine with spun rod bearing. What to do?

Quote:
Originally Posted by Mike_M View Post
Yea that’s what I was fearful of as I know how well I took care of my engine.

But wouldn’t the benefit of rebuilding be that there’s a ton of new parts? Would it be about the same cost as a used one?

I got quoted about $4k for an engine with 68k miles installed.
We do rebuilt S54 shortblocks with Pauter rods and WPC treated bearings for $5k. Heads typically require at least decking, pressure-checking, checking guides, and replacement of valve seals. All of that can be done for another $1k. Or if you think your head is in great shape, you can just bolt it on to a rebuilt shortblock. So a rebuilt motor will cost a little more, but it will have zero miles on it, you will know what you are getting, and critical parts (rods and bearings and rod bolts) are significantly upgraded.

--Peter
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Old Wed, Feb-14-2018, 05:08:08 AM   #10
Mike_M
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Default Re: Engine with spun rod bearing. What to do?

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Originally Posted by GeorgeH View Post
That is a fantastic price including labor for a 68k mile engine. I'd be concerned with the quality of work you get at that price an be looking out for any hidden costs.
Apparently he flips 'M' cars so its a quick process for him and he's had the engine for awhile.

But that's the thing, you never know.
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Discussing Engine with spun rod bearing. What to do? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)