V6 Terrano rev counter issue

[hamboy]

Hey guys my old mans V6 terrano ha picked up a bit of an electical gremlin. The rev counter swings wildly, stops compleatly then starts working fine. Does anyone know where the problem would be?
Any ideas are much appreciated
Cheers

[slide]

Might be easiest to try a S/h cluster and see if that fixes problem. Much easier than tracing circuits and checking voltages/pulses...

[icekayak]

Haven't working it out yet but my td27 does the same thing...

[DEATH_INC]

Haven't working it out yet but my td27 does the same thing...

Yep, mine too.

[wax]

Bent needle does it.

[hamboy]

Bent needle does it.

Nah its not bent needle syndrome this time

[icekayak]

Have talked to a few people and did a bit of research and found out these suffer from dry joints in the solder.

Found this sitehttp://www.gtr.co.uk/forum/151359-crazy-rev-counter-fixed-guide.html, mine was quite different in construction, but gives an idea of what you are looking for. (I only resoldered the big joints, 1 of the legs of the ic, and one of the legs of the resistor, basically anything that looked possibly slightly dodgy)

Put it back in and it works perfectly (for now anyway).

The one catch is I had to pull the needle off to get to the circuit board with the soldering iron so now its out of calibration...

[slide]

Easy way (rough way ) to recalibrate is to leave plastic trim off, remove needle, then refit needle carefully while engine is idling. Put needle to point to what rpm it used to idle at (eg put at 800, if it idles at 800 rpm)
Gets it close enough that no-one else would know the difference.
Cheers for the link, could well come in handy

[hamboy]

Easy way (rough way ) to recalibrate is to leave plastic trim off, remove needle, then refit needle carefully while engine is idling. Put needle to point to what rpm it used to idle at (eg put at 800, if it idles at 800 rpm)
Gets it close enough that no-one else would know the difference.
Cheers for the link, could well come in handy

Been there, done that, but with the speedo and a navman. Cheers icekayak for the link sounds like a rainy day job

[icekayak]

Easy way (rough way ) to recalibrate is to leave plastic trim off, remove needle, then refit needle carefully while engine is idling. Put needle to point to what rpm it used to idle at (eg put at 800, if it idles at 800 rpm)
Gets it close enough that no-one else would know the difference.
Cheers for the link, could well come in handy

Yep thats what I did, though it hasn't been working that long I have no idea what it is idling at but just put it back on at 750rpm which should be around there somewhere (diesel).

Whole thing was under an hour from start to finish, but maybe I just got lucky picking the correct pins to resolder.