[Vwdiesel] Rebuilt IP / Engine Won't Start

[William Longyard]

Hi Brian,
I don't think the problem is the cylinders, I think it is the IP.  I say 
this because I can get the engine to idle, but as soon as I give it ANY 
throttle, it dies immediately.

Bill


----- Original Message ----- 
From: "brian gochnauer" <brian at gochnauer.net>
To: <vwdiesel at vwfans.com>
Sent: Sunday, September 21, 2008 10:37 AM
Subject: Re: [Vwdiesel] Rebuilt IP / Engine Won't Start


> I've rebuilt hundreds of Caterpillar diesels and have often had to ream 
> the
> ridge to get the piston out, but would never use a cylinder (liner) that 
> had
> a ridge in it. I've never rebuilt a VW diesel, but have heard this reaming
> honing and puting new pistons and rings in the bore on forums many times.
> I find it hard to believe that this can be a good practice, I'd say that a
> ridge would be at least .020 to bore size and is VERY hard to accurately
> measure because of the slope of the ridge.
>
> William,
> If you measured the bore after completely removing the ridge, what was the
> bore size.?
>
> I'd say leaving any ridge in the bore is going to be a problem because the
> new piston and ring could constantly 'slapping' that ridge and break the
> piston ring. Honing is only going to make the bore bigger. Fitting the 
> ring
> (gap) in the bore is going to be far from good considering the taper.
> Although a crank speeds the rings may expand fast enough to keep a seal
> against the cylinder wall at higher speeds that is going to more 
> difficult.
> Of course that explains why I hear about people re-ringing the engine 
> every
> 50k miles, to keep it running.
>
>
> On Sat, Sep 20, 2008 at 10:09 PM, William Longyard
> <longyard at ix.netcom.com>wrote:
>
>> I've got a rebuilt IP pump that I just put on my rebuilt engine.  I'm
>> having
>> trouble starting it.
>>
>> I used new turbo piston in my 1600NA engine, and I ridge-reamed and honed
>> before installing them.  Ring gaps are to specs.
>>
>> My compression from 1-4 is: 380, 385, 380, 375psi.
>>
>> I believe this compression is low, but know that the rings haven't seated
>> yet, and those are figures for a stone cold engine.
>>
>> When I crank over the engine for a long time it ALMOST wants to run, and 
>> a
>> couple of times I have been able to get it to run for a few seconds.  I
>> found that by backing the idle screw all the way OUT, it seems to want to
>> run a little bit more.
>>
>> However, if I step on the throttle it dies immediately.  Is the governor
>> set
>> wrong?  How do I set the governor?
>>
>> Other ideas?
>>
>> Thanks,
>> Bill Longyard
>>
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