Compression tester with VWs

Cusser · Posted: Fri May 17, 2013 12:19 pm Post subject: Compression tester with VWs

I have a SunPro compression tester, but never used it on a VW before.

It's difficult to get ththe rubber hose/threaded end to screw in, because of the angle, the recess,a nd not being able to line up directly because of the flexible rubber hose. There's a 14mm extender but I'm wary of that falling in if I try to screw that in first, like it won't stick in my 5/8 spark plug socket. Any hints, or have some of you made a little adapter yourself? That's what I'm thinking of right now. Thanks.
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297

MRJEL · Posted: Fri May 17, 2013 3:02 pm Post subject:

I've got a Lisle, which is quite similar to the Sunpro. I screw the adapter on the hose, then into the cylinders. Never had trouble doing that. It's about the same as using a length of hose to start a spark plug!

Some times the adapter stays in the hole when you remove the hose, but a plug wrench gets it right out.

Cusser · Posted: Fri May 17, 2013 4:42 pm Post subject:

Does your kit's flexible hose have threads that also fit the spark plug hole, and that can also thread into that short 14mm spark plug thread adapter in the kit, so that really gives you two ways to thread in (theoretically)?

That's what mine has.
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297

bowtiebug · Posted: Fri May 17, 2013 4:56 pm Post subject:

I have a snap-on compression gauge , it has different hoses for every spark plug size long or short .
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MRJEL · Posted: Fri May 17, 2013 5:30 pm Post subject:

Tim Donahoe · Posted: Fri May 17, 2013 5:49 pm Post subject:

Does any manufacturer make a compression tester that simply has a metal adapter that you can screw into the spark plug hole--one that's long enough to stick out of the engine tin so you can snap on your rubber hose?

I have the rubber hose arrangement. And it's a joke to screw in that bendy hose into an engine that's installed. It would be nice to have a tester that has a long enough adapter to do what I mentioned above.

Tim

Cusser · Posted: Fri May 17, 2013 6:39 pm Post subject:

MRJEL · Posted: Fri May 17, 2013 7:33 pm Post subject:

Cusser · Posted: Mon May 20, 2013 12:03 pm Post subject:

OK, here's what I've done so far, since this is not for my own VW:

I used a small rubber stopper with a hole in it, drilled the hole larger from the big side, but only about 1/2 through. I inserted a plastic double hose-barb connector into that, and used a rubber hose (1/2 inch heater hose) on that connector up over the compression tester flexible hose's 14mm threads, and secured that with a hose clamp.

So hopefully I can just hold that rubber stopper in the cylinder head threads and get a reading, like with one of those "universal" compression testers (like in the $50 tool at O'Reillys, but not in their loaner tool, which is like the one I already have). I'll let you know if this works, out of pocket cost so far is zero, I had all that stuff.
_________________
1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297

drs1023 · Posted: Mon May 20, 2013 12:20 pm Post subject:

I have a SunPro that's a few decades old. Your and mine must be very different. I use mine all the time at any angle just by bending the hose and holding it at approximately the correct angle to the plug hole while turning the other end.

A friend of mine uses 3 anti-foul extenders tacked together to get past the tins on his cars with limited clearance. His is an old Snap-On.

Cusser · Posted: Mon May 20, 2013 2:38 pm Post subject:

No, I think my SunPro is like yours. It's just difficult to get it threaded like that...maybe because it was pretty dark, and the guy had run his engine so it was still likely to burn me....

Mine looks like this..basically the flexible hose hits the body of the VW, throws off my other hand to keep it straight...
http://www.jegs.com/i/Sunpro/885/CP7827/10002/-1?C...QgodDEQAAg

Image may have been reduced in size. Click image to view fullscreen.

_________________
1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297

drs1023 · Posted: Mon May 20, 2013 4:11 pm Post subject:

Yeah, that's the same one.


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