How to do a VE V6 (LY7) Compression Test?

[Shen Long]

Any suggestions on the correct method of doing a VE V6 (LY7) compression test???

I’ve got the upper intake manifold off & thought I’d give the engine a comp test as she’s done 250K

 

[J_D 2.0]

Same way you’d do any engine I would assume. Pull all the plugs so the engine free spins with no compression, remove the fuel pump relay, whack on your pressure tester and start crankin.

 

[losh1971]

Yep and just don't go WOT like you would on an earlier bus. If you do you can set a code because of the way the TB is set up.

 

[J_D 2.0]

Yep and just don't go WOT like you would on an earlier bus. If you do you can set a code because of the way the TB is set up.

Not a problem with the alloytec as your removing the inlet manifold anyway so you don’t need to press the throttle.

 

[Shen Long]

Not a problem with the alloytec as your removing the inlet manifold anyway so you don’t need to press the throttle.

Does the engine still crank over with the plenum removed???

 

[Shen Long]

Same way you’d do any engine I would assume. Pull all the plugs so the engine free spins with no compression, remove the fuel pump relay, whack on your pressure tester and start crankin.

Should I do both a wet & dry comp test???

 

[J_D 2.0]

Does the engine still crank over with the plenum removed???

Yes.

 

[J_D 2.0]

Should I do both a wet & dry comp test???

You normally only do a wet test if your dry test is out of spec (low compression). If your in spec on the dry test there’s no need to do a wet test.

 

[Martbar]

Same way you’d do any engine I would assume. Pull all the plugs so the engine free spins with no compression, remove the fuel pump relay, whack on your pressure tester and start crankin.

Is it still important to turn the motor over the same amount of times for each cylinder?

 

[J_D 2.0]

Is it still important to turn the motor over the same amount of times for each cylinder?

I normally just crank it for 5 seconds or so.