Which Gear ??

If you drive a Pajero NM-NP 3.2 DiD, there is a strong warning in Service Manual not to turn motor backwards as the cam chain tensioner can be damaged and there has been a couple of broken cam chains reported on the Victorian Pajero Club forum which may be due to the motor being turned backwards - cost many $$$$ to repair.

Best to leave in a gear that will turn motor in normal direction i.e. 1st if facing down hill, reverse if facing uphill.
Mal

I'll go along with that. Some of modern motors can skip a tooth on the timing belt if turned backward.
Lex

cmon phil bit hard with a tojo
although they manage it with the work ones due to them being adjusted every fortnight.
my 80 was done about 6 months ago and does not work one bit now - time to get it looked at again

Mal and Lex, Thanks for the correction, I pressed the send button before getting my brain in gear.

Get Outmore, I know a lot of people have problems with the Tojo handbrakes, but I am puzzled why. I've owned almost every series of LandCruiser and haven't had a problem with any apart from the transmission drum that was on the 55series. I adjust them every 15-20,000k. On the later drum/disc rear brakes, I back off 3-4 notches each side - I wonder whether some mechanics back them off too far or try to get by with just a cable adjustment.

"BUT REALLY" well let me inform you I have been driving for 24 years and have heavy vehicle licence so definately know how to drive and how to park and what gears to drive. "Engine braking" yes I have had a lot to do with that driving semi's over a 20 year period so yes I have a pretty good idea on how it works. I was just asking what other people do when in either of these situations. ""It all has to do with engine braking which you really need to understand BEFORE you can drive a car properly."" most people who have been driving for years and have no interest in cars would know very little about engine braking, they would probably say "yes that what brakes are for" Sounds like you need a drink or two to hold bak on your arrogance. Sorry, a bit harsh but really! WHG

And you wonder way people don't like to ask questions on this forum

So do you think the engine braking is the same turning the engne backwards as forwards?

Wallaby, when reading WHG's question, I to thought he was having a lend of us. I also think Lyndons reply was a little strong but seen worse.

One side of the recent 'moderation debate' had their asses kicked and my reading of your comment suggests that the other side are still throwing stones.

The kerb, gentlemen, the best braking system when parked either way.


Cheers.......Lionel.

rude fools like you lyndon are the reasen so many of us wont pay to join.

Rockape

>I have always been taught to use the gear that doesn't allow your motor to turn backwards<

I take it you mean gearbox.

I know that some 2 stroke diesels like Euclid Scrapers can run their engines in reverse mode but normal 4bies or cars?

Cheers

Willem,
Note! the statement was turn backwards, not run backwards, and yes I meant a suitable gear so if you have a runaway the motor turns in its normal running direction.

Yep, the Detroit 2 stroke series of engines and Commer knockers will run backwards (not very well mind you). Used to have the problem with a 71 series Detroit suction cutter engine in a dredge, you would hit something solid on the bottom and the resulting shock would be sent back through the hydraulics, stopping it and sending it backwards. Lots of smoke and sometimes a broken supercharger drive shaft or seals in the supercharger destroyed.

yep the 2H diesal will run backwards - years ago there was a mines department alert about it.
that is why the 2H has a low oil cutoff after 10 seconds and the 1hz does not

the rotary fuel pump of the 1HZ does not allow it to run backwards

its always reverse that has the lowest ratio

The vast majority of cars sold today are automatics so engine braking is irrelevant to the average motorist. The amount of wear saved on brake pads would be immeasurable. I've been driving autos for a few years now and have never noticed any difference in pad wear versus my days driving manuals.

I would rather change brake pads then auto clutches :-))
.

I dont see that autos make any difference to the theory of engine braking. I use my auto box exactly the same way as a manual if I require engine braking, particularly towing an unbraked trailer. I suppose most auto drivers dont go past D ,but the option
is still there, maybe not adequately explained to auto drivers. If in
any doubt of parked vehicle rolling, I chock it......oldbaz.

I agree, OldBaz. Mine is a Super Select auto, in the paj anyway, and I manually select when towing, but my comments relate to the average motorist in the average car.

Oldbaz, On most older vehicles you need a certain number of revs to engage the torque converter. Any less and you will free-wheel unless you can manually 'lock' the torque converter or be in low low. So unless you up the revs by using foot or hand throttle the vehicle may freewheel.

.

Kiwi Kia, ,while I dont doubt your theory, I have no such experience with my 2000 V6 Jack. I only select the lower gears when on steep descents or in 50 kph zones. I locked it in 2nd
on the Bungle track at mostly low revs & had no issues, that was towing a C/t. Under normal conditions I let the auto do its thing.
Is this freewheeling particular to any vehicle ? My 94 Peugeot
auto will actually downchange twice if running up to a stop with no throttle, with no action by me, but never freewheels.......oldbaz.

Hi Oldbaz, My vehicle is a 2.8 TDI Pajero. When you are going down a very steep track (or hill) can you take your feet off the brake and leave it on the floor without the vehicle 'running away' ? I can only crawl down a steep track in low range low, all other gears the vehicle will accelerate by itself.
You need to maintain an engine speed of about 1k engine revs to lock the torque converter unless you have done a modification and put an extra switch on the dash which allows a lock-up in other gears. Some modern vehicles can lock-up the torque converter in all gears in low range.

.

Why do people use gears to slow down , its not a race car . Or maybe it is ?

thats pretty much what i got told when getting my truck liscense
you might use the correct lower gear to keep speeds down on descents like the adelaide or perth hills for example but not use gears for slowing down for city driving.
use the brakes then select the correct gear for the speed

That makes sense. There is a time and place for engine braking eg I've travelled through Cunningham's Gap in QLD and the trucks are creeping down in first gear at about 5 km/h as it is so steep. They would cook their brakes if they used them all the way down.

Jacobs engine brakes and exhaust brakes have been around for years on truck engines with no problem at all.

I reckon engine braking stems from the old days of drum brakes and heavy loads down-hill , lowest sensible gear and feather the brakes to keep them cool,once the drums heated up no amount of boost would help much. On a lighter note,horse and cart used engine braking! left rein-left, right rein-right, both reins-whoa!!as well as the leather block on steel rim footbrake.In my childhood bakers and milko`s all used horse and cart,the old horse knew exactly where to stop,oops I digress,aaahh memories.

Errr....

Wouldn't it have to have been parked in 1st for the motor to start backwards if irt was facing uphill?

Reverse is lower in most cases Shane

I think you are mistaken.

Hi Mate, already going up to Forster for that weekend dam it, sounds like it will be a great time, spewing. ""When are you coming out with us for a play?????? "" Yeah definitely up for a bit of fun, has been a while since we have done any 4wdriving. Going up to stockton on sunday for a run with some neighbours, first time out with bubs so will be interesting lol not that she will have much say in it as she will he harnessed in nice and tight. Any one welcome to tag along if they like, suppose to be 28 up there so should be a nice day. About 6 vehicles going all up maybe a couple more. Wont mention nothing about those jeeps, there better off road then my prado lol, but I can lend you another extinguisher if you like ?? WHG

No offence taken Lyndon, we all have to eat hunble pie occasionally eh, Ive jumped too quick before and not read a post properly, maybe I should have also explained /written the question in a better way, anyway at last you had the balls to reply even thou it really wasnt needed, at the end of the day every one is entitled to their own opinion, all good, have a great day, WHG

Good on yer Lyndon, its takes a big man to sidle up to a fight and a bigger man to admit he was wrong.