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Post by zerudahime on Apr 17, 2014 10:11:10 GMT
Hello
I have this switch that's labeled as the engine brake according to the manual, but i can't tell if it actually does anything at all except for lighting up.
So, What does it do? How do i know if it's working? How do i know if it's not working?
Thanks
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Post by macplaxton on Apr 17, 2014 10:28:58 GMT
Low ratio hold.
Driving at 20mph, turn it on, transmission goes low and engine revs rise accordingly. If no difference, suspect primary unit diaphragms holed/leaking.
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Post by ozzie on Apr 18, 2014 5:43:54 GMT
Or like mine it's wired up wrong and has siezed it's self and doesn't work at all.
Come to think of it not much on Isabel does work.
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Post by zerudahime on Apr 18, 2014 16:36:45 GMT
Thanks for the help, forgot to mention that I'm out of the country and wont be back for another month. I'm just stacking up on knowledge so I can get it back on the road as soon as i get home  |
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andrewthe33
Bigger Belter
I don't know what you've done to me, sir, but you've done me the power of good!
Posts: 158
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Post by andrewthe33 on May 8, 2014 18:33:12 GMT
The other thing to listen for when the engine's on tick-over and the low ratio hold switch is activated is a slight rise in the engine revs, accompanied by a uneven "lumpy" running. This is (if everything's set up correctly) the engine mixture is weakened. If this doesn't happen, something's not working properly.....
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Post by zerudahime on May 24, 2014 7:22:54 GMT
So I'm finally home and man is it good driving the DAF again!
I started by replacing the vacuum hose from the carburetor to the vacuum control valve, and then tested the unit itself.
When opening the throttle it pulls a vacuum from one of the "outputs" going down the the CVT, and when flipping the low ratio switch inside the car it pulls a vacuum from the other "output"
If you stand in front of the car looking at the vacuum lines running down to the CVT, which one (left or light) should have a vacuum when turning on the low ratio hold?
I haven't been underneath the car yet, I wanna make sure the vacuum valve works properly first.
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andrewthe33
Bigger Belter
I don't know what you've done to me, sir, but you've done me the power of good!
Posts: 158
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Post by andrewthe33 on May 27, 2014 17:32:25 GMT
From my experience the 2 pipes leading to the Variomatic unit at the rear of the car have different diameters; the larger pipe is the "change up" one and the smaller one for "change down". If the 2 pipes seem the same don't panic! If you connect them the wrong way round the car will sound like it's in too low a gear when driven and you'll know they're wrong! Drive home, swap the pipes over & see if there's an improvement.
From your description the vacuum valve seems to be working correctly. It is possible that one or more of the pipes has become detached from the primary units at the back of the car, although if the car ticks over properly and doesn't cough or miss a beat when you increase engine speed gently with the car in neutral then this is unlikely, as once the throttle is opened only a little the vacuum is applied to the Variomatic & a disconnected pipe makes the mixture too weak, affecting the running.
Hope this helps!
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Post by zerudahime on May 28, 2014 18:12:59 GMT
Ah, now when I think about it one of the pipes is a larger diameter, thanks!
Yes I think the vacuum valve is working as it should, but the low ratio hold button does not affect the RPM when driving at 20 mph.
I'll crawl underneath the car in the coming days when I have time and check the other end.
But when pressing the low ration hold button, should the car change "up" or "down"?
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andrewthe33
Bigger Belter
I don't know what you've done to me, sir, but you've done me the power of good!
Posts: 158
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Post by andrewthe33 on May 28, 2014 18:39:28 GMT
When driving the car normally the throttle is open and so therefore the "change-up" valve is switched on; operating the low hold switch operates the "change down" valve at the same time, so the effect is marginal. This is the real way to test it: find a quiet road, drive along at 20-30 mph, take your foot off the throttle & operate the low hold switch; you should feel a noticeable reduction is speed & an increace in engine revs. Drive the same piece of road at 20-30 mph & just take your foot off the throttle without operating the low hold switch & see if there's a difference.
Perhaps a better test is to find a downhill road & switch the low hold on when the car's doing about 20mph. The car should rev up and its speed should reduce simultaneously. The low hold switch has the same effect as engaging a low gear on a manual car or locking an automatic in 1st or 2nd gear. it is a change DOWN hold.
More help available!
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