Tachometer on my '86 PT 38'

[Scott Peatross]

Now that Jay got you to the tach sending unit, if you remove the unit you will
find it is driven by a very short drive cable, like a speedometer cable. If
you're frugal, you can clean and lube that cable, and shoot some lube into the
sending unit too. That fixed mine, but mine was erratic only at idle, and would
smooth out as the revs climbed.

Scott Peatross
'87PT40

Jay Darst wrote:

Kevin,

The tach sending unit is in the "V" of the engine, more towards the curb side
and at the front of the engine. Probably about 1 1/2" diameter, has 2 wires
coming out of it.

My tach started acting goofy, so I bought a used sending unit for $20(Holland
Motorhomes).

Lean over the batteries with flashlight in hand, look at passenger side of the
"V" at the front of the motor(still on top of the motor in the "V").

A pretty easy part to replace.

The air governor is just forward of the air compressor. The air compressor is
mounted on the front of the engine, above the transmission. The air governor is
just forward of the compressor and mounted on the inside of the frame rail.

I would pay somebody to change the governor. Claustrophobia got me before I
could lay a wrench on it. You have to be skinny enough to fit between the
transmission case and the frame rail and have arms at least 40 inches long and
not need to see what your doing with your qarms in the way. I paid $35 Labor to
have my air governor replaced after trying to get to it myself.

Jay Darst

85PT40 Springfield, IL





--- In WanderlodgeForum@yahoogroups.com, "Kevin McKeown" wrote:
>
> Greetings,
>
> Been doing a bunch of little things to my BB, and I've noticed that
> my tach is acting wierd. Is the tach electronic, picking up it's
> signal from the alternator, or, is there a sending unit of some sort
> on the 8V92 somewhere? I gave the engine a good pressure washing a
> couple of days ago...maybe I washed something I shouldn't have.
>
> The tach reads normal at idle, and when going to high idle, it
> climbs like normal, then it's all over the dial. There is a 12ga
> wire attached to the batt post on the alternator (along with the
> heavy output battery cable), but removing this little wire does
> nothing to the tach...any idea where the other end of this wire
> goes, and what it's for?
>
> I guessing that the engine has a tach sending unit somewhere...any
> help would be appreciated.
>
> BTW, I'm still looking for that pesky air compressor governor...I
> bought a new one to see what it looks like, but hell, I can't find
> it where everyone tells me to look (Benny at BB said it was curb
> side, inside the frame rail, just ahead of the engine, but I guess
> I'm blind!)
>
> Help please...I don't feel comfortable driving without a dependable
> tachometer (playing the radio, you can't even hear the engine in a
> PT...sorry, all FC owners!)
>
> Thanks
>
>
> Kevin McKeown
> Yorba Linda, CA
> 1986 38' PT
>




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