Leakdown Results :(
08-12-2009, 08:53 PM
#1
Leakdown Results :( Ok so a friend of mine did an LS1 swap into a 240sx. While the motor was out the following was done:
MLS Headgasket
LS7 lifters
Dual springs
Hardened pushrods.
Leakdown comes in at
1-10
2-11
3-22
4-0
5-0
6-11
7-19
8-19
He said that even with the rockers tq# 22lbs he can move them if that makes sense. Well any help would be appreciated. I am think possibly PtV contact? Valeseals? Pushrod length?
Thanks,
Andrew
MLS Headgasket
LS7 lifters
Dual springs
Hardened pushrods.
Leakdown comes in at
1-10
2-11
3-22
4-0
5-0
6-11
7-19
8-19
He said that even with the rockers tq# 22lbs he can move them if that makes sense. Well any help would be appreciated. I am think possibly PtV contact? Valeseals? Pushrod length?
Thanks,
Andrew
08-13-2009, 01:29 AM
#2
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the rockers should be loose when the valve is completely shut. the rocker mount is seperate from the rocker arm. take all of the rockers loose and do a leakdown test. that will rule out pushrods and rocker problems. then it only leaves it to rings, gaskets, ptv problems ect. list what cam u have and what heads,
08-13-2009, 02:58 AM
#3
Sorry I can not believe I forgot to add that info! I was running out the door anyhow it is this cam
http://www.neweraperformanceparts.co...V=fthelcamfb|0
Stock heads with MLS gaskets.
After checking it out I worry he has piston to valve issues.
http://www.neweraperformanceparts.co...V=fthelcamfb|0
Stock heads with MLS gaskets.
After checking it out I worry he has piston to valve issues.
08-13-2009, 07:43 PM
#5
With the leakdown gauge attached and pressurized, whip out your mechanic's stethoscope and listen for the source of the leak.
Intake valve = hiss audible at the TB
Exhaust valve = hiss audible at the exhaust manifold
Rings = hiss audible at the dipstick
Intake valve = hiss audible at the TB
Exhaust valve = hiss audible at the exhaust manifold
Rings = hiss audible at the dipstick
08-13-2009, 09:26 PM
#6
Gasket: air bubbles in coolant tank. Removing the rockers is a good idea since it doesn't take a lot of work to put them back on. Make sure piston is a TDC. It doesn't matter what stroke your in in this situation since you've got the rockers and pushrods removed.
