318ti.org forum - View Single Post - Trust factor with buying from salvage/junk yards

pdxmotorhead · 03-03-2011, 05:54 PM

I'd use local wrecking yards if I had to go that way...

Basically I'd do a leakdown on any used motor I was buying.

All you need is a small Co2 bottle, a regulator(with gauges) a hose, "T" a small ball valve and a compression tester. Put the T in the compression tester between the gauge and the hose, put the valve in the unused port on the T hook the hose from the regulator to the valve and youv'e got the stuff to leak the engine down. Do each cylinder at TDC Compression and you should be less than 10% for a tight motor. It can be done with the engine on the ground and a breaker bar to turn the motor over...

Investing in a small CO2 setup is never a loss, you can always use it for a keg later.. or your mig welder... LOL

Dave

03-03-2011, 05:54 PM	#2
pdxmotorhead Senior Member Join Date: Mar 2005 Location: Portland Or Posts: 2,666 iTrader: (1) Photo Gallery	I'd use local wrecking yards if I had to go that way... Basically I'd do a leakdown on any used motor I was buying. All you need is a small Co2 bottle, a regulator(with gauges) a hose, "T" a small ball valve and a compression tester. Put the T in the compression tester between the gauge and the hose, put the valve in the unused port on the T hook the hose from the regulator to the valve and youv'e got the stuff to leak the engine down. Do each cylinder at TDC Compression and you should be less than 10% for a tight motor. It can be done with the engine on the ground and a breaker bar to turn the motor over... Investing in a small CO2 setup is never a loss, you can always use it for a keg later.. or your mig welder... LOL Dave __________________ Dave - PDX 1995 318ti - Active Black and Tan. 2005 330xi - Mtech 1 - 6spd - Orient Blue/Black