Fiecos Dan

i dont know the proper name, its puts vacum into the ports, and gives the operator a reading on how good the valve/seat are lapp'd in.



it connects to a airline,
and you push it over the port face, and press a trigger, and it show on a gauge whether the valves well seated, etc ect.





Anyone help?

thebigyin

leakdown tester?

dave green

You mean a valve leak test . When you take the plug out put that cylinder on TDC and find out weather the valves are leaking by putting compressed air in the cylinder.

Dave

Rs1

iTrader: (1)

No lads thats a leakdown test.....although ive never actually seen a valve seat tester like the one descibed

Fiecos Dan

Cheers


but i've already got leak down testers.


This machine, test's the valves and head ports only.



Used one a few times @ a local engine builders, He got it from a Car Show, and cant find the reciept for a phone number, or make.

S3an

took my cossie head to a machine shop wid the new valves and they cut the valve seats to match the valves. cost Ł2 per seat to do. cheap as chips and done a stonking jub. car runs spot on.

Fiecos Dan

Thats all good,


but i've seen problem valves, after gring of the seat and valve, and a quick lap, it still didn't seat propertly, when testing with this tool, and took lots more lap'n to get perfect.


Also this tool can be used with head still on car, just need to remove the mani's to test.

Fiecos Dan

Anyone? please.


or is this a very rare, un none tool??

PGT

when i took my car to MSD they pressurised the whole intake system from turbo inlet on with 30psi and it should hold this for a while (cant remember how long) and slowly leak away. this obviously tests everything including valves.

Fiecos Dan

Cheers,

but i do that as well, but only really tests for boost leaks, not good enough for valves.

GARETH T

i gotta be honest, ive never seen the tool your on about,, but i can guess how i would make one

DazC

iTrader: (1)

Can you not make one from a cylinder leakage tester?

Fiecos Dan

Yeah, i thought of making one.


The one i've seen/used has 8 bar vacum when fully sealed.

its got a selection of different suction pads to fit different heads/ports (about 8 in total)

on its gauge,

8 bar is perfect with valve springs fitted
7.5+ is perfect for valves with no valve springs, but i like to see 8 bar.
6-8 bar vacum held in the port is in the green zone as ok.
below 6 bar is real bad.


i thought about using my mighty vac, but that dont do 8 bar vacum.

GARETH T

i guess you could,, but the problem being the pressures could be large so it could lift the valve! i would use a vacuum system to avoid that error

GARETH T

nothing can do 8 bar vacuum,, thats 7 bar below absolute steven hawkings would be impressed

richard_syko

You could do it on a flow bench but, that would be an expensive tool.

I suppose to some extent charge pressure would help keep the vlave closed.

Fiecos Dan

i might be wrong (units), so i'll check next time i see it, or asked my mate that works there.

GARETH T

only teasing mate

DazC

iTrader: (1)

May have been 0.8 bar!!

I understand where you're coming from there Gareth with the pressure forcing the valve open. How about those suction pressure brake bleeders which work off air to create a vacuum in a container?

Or how about pressurising the combustion chamber using the cylinder leakage tester again (although that wouldn't indicate which valves were at fault).

Fast Guy

I haven't seen it done on the car before, but don't they normally do it with a flow bench? Just mounting it on the inlet face instead of the combustion chamber face?

GARETH T

could be an idea,,, pressurise the cylinder,, then have a pressure gauge sealed in the port,! if the pressure rises,, the seat is leaking

Fast Guy

If the head is still on the car in that case, you're just doing a leak down test. Which may work, assuming the rings, head gasket and exhaust valves are all sealing 100%

Fiecos Dan

but that cant be done with the head off the car.


the one i've used, gets pushed against the mani face of each port.

Fiecos Dan

Upski.