300tdi rebuild

Joined: 15 Jan 2004 Location: gold coast

just spun a conrod bearing at the crankshaft.
getting rebuilt

new head 8 months ago.

what should be done while its open?

Serg

Joined: 23 Jul 2005 Location: Canberra

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.

Joined: 12 Jun 2005 Location: Yinnar South, Vic

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.

I'd be concerned about the rebuilder Mad

Joined: 21 Aug 2003 Location: Upper Hunter Valley NSW

cloughy wrote:

I'd be concerned about the rebuilder Mad

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.

Joined: 15 Jan 2004 Location: gold coast

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

Joined: 23 Jul 2005 Location: Canberra

I think the balancing included:
pistons and rods
crank
Flywheel
and because I was going Auto, they also did TC and flywheel

Joined: 19 Feb 2003 Location: Perth, WA

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/balancing/index.html

This is a bit more technical:
http://www.circletrack.com/techarticles/ctrp_0504_engine_balancing_tech_terminology/piston_rod_crank_balancing.html

Joined: 21 Aug 2003 Location: Upper Hunter Valley NSW

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.