Page 1 of 2
Leak Down Test
Posted: Thu Oct 10, 2013 11:08 pm
Author: Taffus
OK, Been purchasing and I have bought (a few months ago) a leak down tester!
Set the GPz up today to check the offending cylinder but sodding fittings don't match my compressor!
Anyone got any good advice on using one of these instruments?
Posted: Fri Oct 11, 2013 6:29 am
Author: Garn 1
Taffus, I would be interested to know what a Leak-down tester would include.
I would expect a screw adaptor for the spark-plug hole connection.
A pressure gauge.
Your own compressor (up to 130PSI... guessing!)
A control valve.
As I understand, you can spot defects such as worn rings/bore, faulty inlet and exhaust valves by the rate of escaping air from the combustion chambers.
I would think the main part would be listening for a "hiss" from valve at the inlet or exhaust port, the cam-cover or the sump. Still I think a fair bit of experience would be needed to diagnose the rate of pressure drop and where the air escaping from.
Would appreciate your comments.
RegardZ.
Posted: Fri Oct 11, 2013 7:14 am
Author: KeithZ1R
I too would be interested on how the whole procedure works as its somthing ive never done. I get Rob knows and could explain :-)
Posted: Fri Oct 11, 2013 8:14 am
Author: ZedHead
You can get fitting adapters off ebay. Do you know what fitting you have/need?
Posted: Fri Oct 11, 2013 8:21 am
Author: Taffus
Hi
My fittings are "euro" connectors, I have .5 inch in stock but need 3/8 male
Posted: Fri Oct 11, 2013 11:08 am
Author: z1bman
Posted: Fri Oct 11, 2013 11:28 am
Author: Taffus
No, mine are Euro connectors, these are PCL connectors, all my lines have euro connectors thanks for looking
Posted: Fri Oct 11, 2013 11:39 am
Author: z1bman
Posted: Fri Oct 11, 2013 11:44 am
Author: Taffus
That looks like the right ones, thanks again!
Posted: Fri Oct 11, 2013 1:20 pm
Author: steve bowdler
Posted: Sat Oct 12, 2013 3:14 pm
Author: Taffus
Comleted the leakdown test. Very interesting
Cylinder 1 leaks from inlet and exhaust valve
Cylinder 2 no leaks from inlet and leaks exhaust valve
Cylinder 3 no leaks from inlet and leaks exhaust valve
Cylinder 4 no leaks from inlet and leaks exhaust valve
No sound of air in the crankcase. I am guessing that the cam timing is incorrect for the exhaust (I have slotted cam wheels)
Just got to strip the head off and fit the 1170 barrels and J head now and shim up and put fixed cam timing in
Posted: Sat Oct 12, 2013 3:29 pm
Author: PAULJAC47
Taffus is your engine at TDC?
Posted: Sat Oct 12, 2013 3:51 pm
Author: Taffus
Checked against the T mark for each cylinder but didn't use a degree wheel
It was my first attempt though so It could be strewn with school boy errors!
Leak down testing
Posted: Wed Oct 16, 2013 8:44 pm
Author: Garn 1
Would anyone like to give a summary of how to perform a leak-down test?
What is the kit that Taffus purchased?
RegardZ.
Posted: Wed Oct 16, 2013 9:33 pm
Author: z1bman