[Vwdiesel] Piston Ring questions

[James Hansen]

smokes on startup.... Did you do the head, guides, seals?

Compression test?

that will give a good indication of cylinder wear.

-j

 

From: Stephen Kraus [mailto:ub3ratl4sf00 at gmail.com] 
Sent: February-09-13 7:35 PM
To: James Hansen; vw fans
Subject: Re: [Vwdiesel] Piston Ring questions

 

This will be my 2nd tear down, the engine runs but it smokes on starting and
has a lope in the firing sequence.

I love this damned thing.

On Sat, Feb 9, 2013 at 8:33 PM, James Hansen <jhsg at sasktel.net> wrote:

lol... true enough.

I have a 6.0 litre ford spread across my shop at present for the second
time.

yes, second time..... grrrrr....

-j

 

From: Andrew .Libby [mailto:libbybapa at gmail.com] 
Sent: February-09-13 7:30 PM
To: James Hansen
Cc: Stephen Kraus; vw fans
Subject: Re: [Vwdiesel] Piston Ring questions

 

Even if it's a car you're not keeping it's worth it in the long run to do it
right.  :-)

 

On Sat, Feb 9, 2013 at 6:26 PM, James Hansen <jhsg at sasktel.net> wrote:

You need to measure the cylinders, and the pistons.  You don't change rings
sizes to fix that kind of wear, the bore to piston measurement is the one
that is the big deal. CLosest thing you can accomplish would be to get file
fit rings, and set the end gaps yourself, but that  doesn't do sweet FA to
make the ring shape of the piston ring conform to the bore it is oversize
in.  Rings are made for a very narrow range of size.  Stretch one side, you
no longer have a circle.
If the pistons rock in the bore, you're more or less screwed, but really,
you need some measuring tools. Outside micrometer and either a dial bore
gauge, or minimum, a telescoping bore gauges which are quite economical, but
have the most operator variability.
If it's a car you're keeping, it's worth it in the long run to do it right.
my 2 cents anyway.
-james


-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of Stephen Kraus
Sent: February-09-13 5:43 PM
To: vw fans
Subject: [Vwdiesel] Piston Ring questions

So, I'm about to do a ring job on my 98 Jetta TDI, but I'm rather worried
I'm going to need to bore and buy oversize pistons due to compression
issues.

Are there slightly oversized piston rings you can buy, or am I screwed?
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