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

Tony and Lillie tonyandlillie1 at earthlink.net
Sun Feb 15 19:10:18 PST 2009

Where is this "Cheesman's" writeup on the gas to diesel tach?


----- 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?
>>> _______________________________________________
>>> Vwdiesel mailing list
>>> Vwdiesel at vwfans.com
>>> http://www.audifans.com/mailman/listinfo/vwdiesel
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