Rod Bearing repalcement

[amcink]

I need a road bearing replacement diy - I already search

[jlevie]

If the engine has a rod knock or a bearing has spun, at the very least the crank will have to be removed from the engine, checked for wear, and polished. That means removing the engine from the car and tearing it down. As to a DIY, you'll want the Bentley manual for the procedure, torque specs, and journal dimension table.

[amcink]

Would it be better to get a new bottom end and just replace it??

[jlevie]

What to do is driven by how much wear there is in the engine. It also matters what engine this is. It is very easy to find affordable lower mileage ETA engines. M20B25 engine will cost a bit more. SuperEta engines are more rare than ETA or i/is/ic engines and thus more expensive. An engine for an ix will be harder to find and more expensive.

While one can make a guess on the condition of the engine, just based on mileage, until the engine has been torn down and inspected an estimate of the repair/rebuild cost is impossible. In most cases it will be condition of the cylinder bores that determines whether to rebuild or replace as far as economics go.

[amcink]

Can I remove the crank from underneath the car - without getting the motor out?
Can rocker arm make a loud noise such a rod bearing noise?

[Dj Buttchug]

you might want to just consider replacing the whole engine...

[110stx]

+1 to to the dj ...

I got rod knock on my M20b25 last winter.

Found a good condition, 130k-mile short block. I think I paid $90 for it.

Slapped in some new bearings and oil pump, since we could.

Bolted on my rebuilt cylinder head.

Voila.

I'm saving the old block and parts for an overbore-based rebuild as a long-term plan. That engine will then go back into the e30.

Done.

[dchun]

Can I remove the crank from underneath the car - without getting the motor out?
Can rocker arm make a loud noise such a rod bearing noise?

technically yes but you would have to remove the transmission first.

i would just source another engine

[amcink]

+1 to to the dj ...

I got rod knock on my M20b25 last winter.

Found a good condition, 130k-mile short block. I think I paid $90 for it.

Slapped in some new bearings and oil pump, since we could.

Bolted on my rebuilt cylinder head.

Voila.

I'm saving the old block and parts for an overbore-based rebuild as a long-term plan. That engine will then go back into the e30.

Done.

So If I understood get a new engine and just used the bottom end with the good head i have and then marry the old bottom end with the head from the used (new) engine found? Did I understood this right?

[Dj Buttchug]

yea or get a complete long block. m20s can be had for a few hundred bucks. Snag one up and just swap everything over.

my gathering is that you dont have much wrench time... (could be wrong) but the simplest and easiest way to get the car back on the road would be to swap engines completely

[E30 331is]

you might want to just consider replacing the whole engine...

How bout if its an S14? What would you recommend for that?

[Dj Buttchug]

How bout if its an S14? What would you recommend for that?

swap s50 and boost it. for the price to fix an s14 or find another engine youd be in the same price range.

[jlevie]

How bout if its an S14? What would you recommend for that?

Since an un-molested E30 M3 is worth far, far, more than one that has been bastardized, rebuild the S14.

[amcink]

yea or get a complete long block. m20s can be had for a few hundred bucks. Snag one up and just swap everything over.

my gathering is that you dont have much wrench time... (could be wrong) but the simplest and easiest way to get the car back on the road would be to swap engines completely

You are correct some wrench time but not a lot the most i've done is mthe vanos on the e46 but not a motor swap. I would like to keep the head since it is an 885; will look for a long block first unless I find a good motor (this motor only had 157K miles and that is low for an 87).
Thanks for the input much appretiated

[Dj Buttchug]

Since an un-molested E30 M3 is worth far, far, more than one that has been bastardized, rebuild the S14.

How bout if its an S14? What would you recommend for that?

purists.... :down:


op. good luck with the fix. sub forum m20 and general discussion can help if you have any questions ect.