Compression Test

[Danielitodiaz]

Hi everybody, I just finished to do a compression test in my 1700 VW engine and three cylinders show 100 plus and one showed 0....maybe the valves are open in that cylinder and loose compression ? or what else could be ? Thanks Daniel

[Glenn]

[FreeBug]

Plug compressed air* into the plug hole for the dead cylinder, and go listen at the intake, the exhaust, and the breather, then you'll have more info.

On those engines, check the valve heights, seats have a bad habit of sinking or popping out.

My bet is an exhaust valve has a piece missing like someone stole a slice of pie.

* you can make this by breaking the ceramic out of a spark plug, a length of tube, cuz it's a type 4, a compressed air coupling and some welding or brazing. If that's not possible, try finding a length of tubing and blow.

[Danielitodiaz]

need to pull down engine to fix it?

[Danielitodiaz]

just finished to replace the push rod tubes (used the spring loaded ones) maybe did something wrong when I put it back together?? didn't change rod position

[FreeBug]

[Danielitodiaz]

sometime back a mechanic rebuilt the engine, after some driving, the car start to sound funny(like something was not running properly, was missing something) The car is a replica Porsche 356 and the original owner exchanged the engine for a high performance (Two Dellorto carburetors) one. I took it to another mechanic and he told me that the first mechanic , when rebuilt the engine, didn't adjusted the carburetors and raw unburnt gasoline washed the cylinder wall.... I didn't believed, but now I have my doubts

[FreeBug]

[FreeBug]

[Danielitodiaz]

[Glenn]

Looks like the #1 intake pushrod tube is missing a seal and already leaking oil.

[jason]

Do those seals even go there? Thought they had o rings inside.

[Axitech]

Yes, those seals go there. Three per tube, no o-rings. My moneys says you need to retorque your heads. Mine came loose and lost all compression on 3+4.
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[nsracing]

Those end seals do not go there in the middle. The O-rings are inside the tubing. Should be a washer on end of those springs pushing on the outer tube.

The concave seals only go on each end. Not middle.

[Danielitodiaz]

Found the problem !!! valves in cylinder 2 were open!!! was loosing compression thru valves....adjusted valves, rechecked compression and all cylinders read 120 or plus....put it back and replaced valve covers....both of them leaked....used some gasket maker and stop leaking. Now I'm rebuilding the Dellorto 36 dual carburetors and encounter another problem... when I try to remove the fuel pump jets(the two screws on the body side) the top part come off but the jets still inside the carburetor...a can't get them out(little springs come out) supposed to be like that or is a way to how to remove the jets to clean it out??Anybody? Thanks, Daniel

[Danielitodiaz]

[67rustavenger]

The acel jet holders. Can be difficult to remove.
I use the biggest screw driver in my tool box. Mine have a hex area near the handle. So I can get an assist with a wrench on the screw driver. When those jet holders come loose. You can hear an audible snap.

If you have a heat gun. try that on the carb body. A little! Not allot.

Good Luck.
I misread the post. Try to gently push the jets out of the body from the aux vernturi side. Be careful not to damage the Aux vents.
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[Danielitodiaz]

[Danielitodiaz]

they are marked as "idle jets"

[67rustavenger]