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300tdi rebuild

Tech Talk for Rover owners.

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300tdi rebuild

Post by uninformed »

just spun a conrod bearing at the crankshaft.
getting rebuilt

new head 8 months ago.

what should be done while its open?

Serg
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Post by RRturboD »

Serg,

Get it balanced. My motor was reluctantly balanced by the rebuilder because they could see no need for spending the $180, and land rover did not say to balance them. They say it was the smoothest, quietest Tdi300 they had built. They balance all their rebuilds now.
Michael T
Aussie '88 RR Tdi300 Auto
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Post by cloughy »

RRturboD wrote:Serg,

Get it balanced. My motor was reluctantly balanced by the rebuilder because they could see no need for spending the $180, and land rover did not say to balance them. They say it was the smoothest, quietest Tdi300 they had built. They balance all their rebuilds now.
:shock: I'd be concerned about the rebuilder :x
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Post by rick130 »

cloughy wrote:
:shock: I'd be concerned about the rebuilder :x
LOL. The bloke that used to do my machine work also used to do a lot of MB/GPW Jeep 'Go Devil' engines, and Kev used to balance everything, just as if it was one of our race motors.
300Tdi Defender 130 CC
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Post by uninformed »

what do they do when "balancing" the motor in a rebuild?

the head will be sent to be checked etc, should be ok its only 8n months old!

bottom end needs a new crank, bearings and will get a hone and new rings.... anything else?

serg
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Post by RRturboD »

I think the balancing included:
pistons and rods
crank
Flywheel
and because I was going Auto, they also did TC and flywheel
Michael T
Aussie '88 RR Tdi300 Auto
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Post by ISUZUROVER »

uninformed wrote:what do they do when "balancing" the motor in a rebuild?
Quite easy - basically they weigh the pistons, conrods, etc. If they differ in mass they will either mix and match them or shave small amounts of metal off non-critical areas so they all weigh the same.

If you have an accurate (laboratory) balance you can do it yourself.

EDIT - balancing flywheel and crank etc is a bit harder - as they need to be balanced in a similar way to tyres.

This is a pretty good explanation (but the stuff on seasoned blocks is a bit dubious...):
http://411motorspeedway.net/2008/rules/ ... index.html

This is a bit more technical:
http://www.circletrack.com/techarticles ... ncing.html
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Post by rick130 »

and with the rods, you balance each end. It's surprising how far out factory specs can be.

I had the flywheel and clutch assembly balanced when I did the clutch last year. Only cost a small amount extra in the scheme of things.
300Tdi Defender 130 CC
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