[Vwdiesel] Should I Re-Ring?

[James Hansen]

Absolutely, do not use oil on a hot/warm compression ignition motor
compression test.  I don't even use oil at all any more on a diesel
compression test at all, and for sure make certain the glow plugs are not
on. You can hear valve leakage if necessary.  Buddy had compression tester
gauge parts go whizzing by his head from the apprentice in the bay beside
him when exactly that was done. Bad scene, could have been a lot worse.
Your numbers look like just the gasket is bad.  Having cold numbers are good
too.  Reflects more on how well it will start cold, but I'd be happy with
those.  
When you have the head off, make sure it's good and flat between cylinders-
piece of 1/2" glass with 400 wet paper spray glued on, and some light oil is
a really good head and block dresser for gasket prep, and is my go-to piece
for that now. I actually epoxied some clamps on the top of the glass for
that rather than glue, but glue works too.  Sized it for 1/3 of a sheet for
sandpaper.
You can use a spinning bristle disc to dress the block, (which is what I
used to use) but it overtreats the edge of a head sealing surface in my
opinion. Great for other stuff tho.
-james

-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of lbaird119 at aol.com
Sent: January-22-14 10:24 AM
To: vwdiesel at vwfans.com
Subject: Re: [Vwdiesel] Should I Re-Ring?


  Since you'll have the head and pan off, I'd pull a piston and measure the
end gap.  (pull top ring, put it in the cylinder then flip the piston, push
down until second ring stops it, remove and measure the gap.)  I only say
this because I had a rebuild where the rings wore excessively due to the
shop not honing the bore coarse enough.  Otherwise I'd say you have no
indications to need to look.

  Looks like you're leaking between #2 and #3 mostly with #2 possibly
leaking a little into the water jacket but not enough to blow coolant.

  Never use oil on a hot compression test, especially on a diesel.  I had a
302 Ford fire on me and peg my gauge, a diesel certainly could.
    Loren



-----Original Message-----
From: Will Taygan <lists at alaskabiodiesel.org>
To: vwdiesel <vwdiesel at vwfans.com>
Sent: Tue, Jan 21, 2014 6:51 pm
Subject: [Vwdiesel] Should I Re-Ring?


(Crossposting from the Diesel-Vanagon group:)
Background: 82 Stock-ish 1.6NA - 2yrs+35k on bored +1mm rebuild.  Lost
oolant at 10k, lost oil pressure at 34k.  Still running.  Was running ot on
hills under load, replaced thermostat and radiator, helped (like
erfect) for a couple weeks, now running hot and cold every couple iles.  Oil
in coolant, replaced oil cooler, coolant tank stays full.
Plans: replace head gasket, swap oil pan for a turbo pan (a delayed
roject) and install new Peloquin trans coming this week from ATransaxle.
** Compression 400,345,370,400 (HOT), 450,390,440,450 with a spoonful of
-cycle oil.  Is a +50psi with oil sealing like this expected on normal ings,
or would there be a benefit (or disadvantage) to putting new ings in? 
Probably should have replaced the headgasket a long time ago, but my
ompression tester was broken, and it HAS been driving daily (though ust on
local roads, not the highway).
SHOULD I RE-RING?  I'll have head and pan off anyway, but it would be n-rack
with crank in.  I have another engine to rebuild when this one ies, but I
would really like to get this one in shape for summer.
Thanks for you opinions!  I have disassembled a bunch of parts engines, ut
have never done rings or put pistons back in.
Will in Alaska.

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