Viscous Coupling

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H

Harry's Chariot

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22
Dont slate me for what I don't know, but my "mechanic" has advised to disengage the 4 wheel drive temporarily as the viscous coupling is locking up - which may be one of the many reasons as to why I'm having the "3 amigo" issue, as wel as now changing the ECU and another switch which will hopefully turn off the ABS pump at the correct time (already replaced the ABS pump, accumulator) - I don't know, I just pay the bills

Is it acceptable to run on 2 wheel drive temporarily? Ashcoft Transmissions have confirmed they wont have stock of the viscous couplings until June this year, and as they offer the best value, not willing to pay £400 elsewhere. My "mechanic" has said that he has disconnected the 4 wheel drive on several "disco's" for a similar reason, and re-visited the 4 wheel drive when the clients wallet was sufficiently full to cover the job.

Any thoughts or opinions?
 
discos dont have viscous coupling so he hasnt ,you can test yours by jacking one front wheel up ensure gearbox isnt in park if auto or gear if manual with 3ft is bar on wheel nut it should turn stiffly and slowly if it does viscous isnt seized it its locked viscous is seized ,viscous will be seized or not it wont seize then unseize, it wouldnt effect abs ,wheel bearings would as this alters air gap for sensor ,poor sensor is common but you need to read fault codes clear take for a run then read fault codes again,if viscous is seized you can remove a prop and drive in 2wd ,if viscous isnt seized you can test vehicle in 2wd but shouldnt be driven any great distance,doesnt sound like your mechanic understands vehicle or principles of how abs /tc and hd work has he actually had codes read, the viscous is designed to give power to both axles but allow slow slip to prevent wind up during driving were axles may need to do slightly different speeds but any great difference viscous locks
 
Not under cutting James above (as he knows his stuff) but when my old P38 had a seized VCU the ABS went nuts, hence when I tried break it would cut in and I nearly came a cropper a couple of times... New VCU (and rear diff as it exploded big style) and all good :)

Assume that the ABS cut in a saw the wheels moving at different speeds? That was a 95 2.5DT btw...

Have a look at my video on YouTube for testing VCU
 
Can't see that to be honest. ABS cuts in when it detects a wheel or wheels moving slower than the road speed would think they should do. Cannot see how a seized VC would cause that. Unusual for the rear diff to go with a seized VC, much more likely to be front as steering action puts far more load on front diff with seized VC than is imposed on the rear one.
 
wammers said:
Can't see that to be honest. ABS cuts in when it detects a wheel or wheels moving slower than the road speed would think they should do. Cannot see how a seized VC would cause that. Unusual for the rear diff to go with a seized VC, much more likely to be front as steering action puts far more load on front diff with seized VC than is imposed on the rear one.
Click to expand...

I know doesn't mate sense but I remember nearly crashing a few times just before diff went bang because the ABS tried to kick even on summer clean tarmac... although I did have the whole rear axle replaced and not just the diff so could have been something else gone? I just thought a co-incidence but defo VCU which murdered the diff, as when new axle on it was still rumbling/skipping rear wheels hence then discovered what a VCU was, replaces this and all good :)

See my other post re: the garage claiming my current VCU destroying their supplied rear diff, when it hasn't :(
 
Diehard said:
I know doesn't mate sense but I remember nearly crashing a few times just before diff went bang because the ABS tried to kick even on summer clean tarmac... although I did have the whole rear axle replaced and not just the diff so could have been something else gone? I just thought a co-incidence but defo VCU which murdered the diff, as when new axle on it was still rumbling/skipping rear wheels hence then discovered what a VCU was, replaces this and all good :)

See my other post re: the garage claiming my current VCU destroying their supplied rear diff, when it hasn't :(
Click to expand...

As i said, unusual for rear diff to suffer first from seized VC. Odds would be on front one suffering most. But there you go it don't always pan out as it should i suppose. :):)
 
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