[Vwdiesel] Matt's tach venting time...

Matt matt_lisa at sprynet.com
Sun Feb 15 20:28:36 PST 2009

Here's the link:



On Feb 15, 2009, at 8:10 PM, Tony and Lillie wrote:

> Where is this "Cheesman's" writeup on the gas to diesel tach?
> Tony
> ----- Original Message ----- From: "Matt" <matt_lisa at sprynet.com>
> To: "vw fans" <Vwdiesel at vwfans.com>
> Sent: Sunday, February 15, 2009 5:04 PM
> Subject: Re: [Vwdiesel] Matt's tach venting time...
>> Yeah, I'm with you about Roger's idea.  It's a great idea as long  
>> as  everything is working.  I might try to modify a tach with  
>> Cheesman's  idea, but digging up all the parts is going to be a  
>> challenge.  I  found a GTI tach housing that wasn't crunched like  
>> mine, and it has  another tach with it.  I might experiment with  
>> that one some.  I  really want a tach in that car, as not having  
>> one is just stupid.
>> Well, I got the car running.  It looks like the injection pump  
>> jumped  2 or 3 teeth.  The cam/crank were still on, thankfully.  I  
>> couldn't  get the timing to set accurately, so I locked the cam/ 
>> crank and found  that I couldn't lock the pump.  I took the belt  
>> off and moved the pump  gear forward a bit, and everything lined  
>> up.  I set the timing to .95  and it fired right up.  I'm going to  
>> go ahead and get another sensor  for now, and just make double sure  
>> the belt cover doesn't move.
>> Is there a place where you can get all the rubber bits for the  
>> timing  belt cover?  The rubber surround for the rear bolt  
>> vanished, and the  side one is getting weak.
>> -Matt (who isn't quite as mad anymore)
>> http://matt_lisa.home.sprynet.com/
>> On Feb 15, 2009, at 2:36 PM, mark shepherd wrote:
>>> How sad.
>>> Strange how the cover would hit the  sprocket because of the 6mm   
>>> bolt. Are
>>> there not 3 or 4 clips also?
>>> Sounds like at 4000rpm one of you add ons fell off due to the   
>>> vibration,
>>> joggled round the timing belt area and went under the belt  
>>> suddenly  allowing
>>> the belt to jump and mess up your timing. That was the one  
>>> weakness of
>>> Roger's great idea. That is why either making a 'W' terminal is   
>>> better if
>>> you happen to have a diesel tach, and supplement the terminal with a
>>> directly modded circuit for a gasser tach. [As designed by  
>>> Cheesman  for a
>>> few bucks equiv.] As long as alt. belt is not slipping, I've  
>>> found  tach
>>> accurate at all speeds. Belt screeches and you can see revs drop   
>>> off...
>>> Can't say that I've run this engine on my Quantum much over 3.5k
>>> B4 I got a tach on my first TDdiesel Q I admit I did on occasion  
>>> go  over
>>> 105mph.  Too many speed cameras over here to get away with it for   
>>> long.
>>> Mark
>>> ----- Original Message -----
>>> From: "Matt" <matt_lisa at sprynet.com>
>>> To: "mailing list" <vwdiesel at vwfans.com>
>>> Sent: Sunday, February 15, 2009 8:48 PM
>>> Subject: [Vwdiesel] Matt's tach venting time...
>>>> This was a message I sent to the list on Thursday, though it  
>>>> didn't  go
>>>> through since it was down.  I've talked to Loren a bit about my
>>>> problem, but I figured more brains on the problem couldn't hurt.
>>>> ______________
>>>> Hey everyone.  So I got my diesel Rabbit tach all set up and  
>>>> working
>>>> using Roger Brown's optical pickup wheel design.  It was   
>>>> beautiful.  A
>>>> working rev counter in that old car.  Talk about neat.
>>>> So I buttoned it all up and took it for a spin.  It was working
>>>> perfectly, when all of a sudden, the tach went dead.  I wondered  
>>>> what
>>>> the hell was going on, so I started to drive home.  On the way  
>>>> home,
>>>> the car started to buck and kick.  Soon, it would barely run.  I
>>>> hobbled home, and killed the car.  Smoke started pouring out the
>>>> tailpipe.  Now I'm really nervous.
>>>> I pushed the car in the garage and took stock of the situation.   
>>>> The
>>>> front bolt on the timing belt cover had come undone.  Because of   
>>>> that,
>>>> the cover tipped against the injection pump pulley wheel, taking  
>>>> the
>>>> tach optical sensor clean off.  That explains why the tach died.
>>>> There was oil all over the outside of the valve cover.  I hate  
>>>> those
>>>> stupid cork valve cover gaskets.
>>>> I'm hoping the sensor didn't go flying down into the lower belt
>>>> cover.  Looks like I get to pull it apart and have a looksee.  I'm
>>>> still not sure why the car was trying to die.  that doesn't make  
>>>> much
>>>> sense.
>>>> I had the power for the tach converter hooked to the stop   
>>>> solenoid.  I
>>>> figured the car was bucking because it was coming loose or  
>>>> something,
>>>> but when I popped the hood, all was tight.
>>>> It's times like these, I just wanna sell the car and make it  
>>>> someone
>>>> else's problem.  I'll probably just let it sit for awhile, and then
>>>> have a look.  What really makes me nervous, is the smoke smelled  
>>>> like
>>>> coolant.  I've only got 4K miles on this head gasket.  I was at   
>>>> around
>>>> 4K rpm when the tach stopped working.  With my luck, it blew   
>>>> something
>>>> big time.
>>>> So, anyway, there's my situation.  My Rabbit is currently in the
>>>> garage, cooling off.  After I cool off, I'll start pulling it apart
>>>> and try to find out what the hell happened.  I'll keep everyone
>>>> informed.
>>>> A really bummed and pissed off Matt
>>>> http://matt_lisa.home.sprynet.com/
>>>> _______________
>>>> I tried restarting the car the following day, and it would fire and
>>>> die over and over.  It spewed lots of black smoke when it tried.   
>>>> So
>>>> far I've checked the timing which seemed off, so I'm in the  
>>>> middle of
>>>> trying to get that adjusted (thought it's being more of a pain than
>>>> normal.)  Any other ideas?
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