Pre common rail 20 series JD

[Flat 10]

I know that they are less favoured and cheaper, was there a problem with a fuel pump or have I imagined it? It’s not the same pump and injectors as a 10 series is it? @Phil P @Timbo and anyone else. Thanks

 

[Phil P]

I know that they are less favoured and cheaper, was there a problem with a fuel pump or have I imagined it? It’s not the same pump and injectors as a 10 series is it? @Phil P @Timbo and anyone else. Thanks

Bosch VP44 on the very early 20’s and it was hellish unreliable especially if the fuel isn’t 100% it’s basically a sh!te pump! the rest of the engine is pretty much same as a 10 series though.

 

[neilo]

Maybe I’ve been lucky with mine then, as it’s not put a foot wrong in the 9 years I’ve had it (hopefully I haven’t jinxed her now).

I fully expect her to carry on in the same manner, so no plans to change anything currently.

 

[KB6930]

They were very flat power wise compared to the 10 series and the later common rail 20 series. Contractors had 2 6620s one common rail pulled like a train one non common rail with a chip on was still dead as a door nail fir no apparent reason

 

[GeorgeK]

We have an 04 20 series only issues have been the classic dissolvable fuel pipes and oil cooler going pop. Both were easy to fix

 

[biggles]

What year did they change to common rail? Might be looking for one later in the year and it pays to know these things, cheers

 

[Phil P]

What year did they change to common rail? Might be looking for one later in the year and it pays to know these things, cheers

If I remember right it was the end of 2004 and into 2005, most 04 20 series will have the old 2 valve engine and most 06 will be common rail 4 valve. 05 you’d need to look under the bonnet to be sure.
There was a couple of minor changes to the common rail engines later in production but it’s nothing that you’d notice at a glance and doesn’t affect performance.

 

[biggles]

Cheers

 

[Flat 10]

If I remember right it was the end of 2004 and into 2005, most 04 20 series will have the old 2 valve engine and most 06 will be common rail 4 valve. 05 you’d need to look under the bonnet to be sure.
There was a couple of minor changes to the common rail engines later in production but it’s nothing that you’d notice at a glance and doesn’t affect performance.

I’m not sure that’s correct. Mine are both common rail and 53 and 04 reg. I think they changed end 03 time.

 

[Phil P]

I’m not sure that’s correct. Mine are both common rail and 53 and 04 reg. I think they changed end 03 time.

That’s what I said, the change was 04/05 so you will be able to find common rail on 04 and you’ll fine vp44 on 05 it just depends when it was registered. Remember tractors are only registered when sold so stock tractors can be sat in a dealers yard for some time. serial number is the only way to check properly.

But yes Common rail where available in 04

 

[6r 185]

We had a 6520 and that was common rail on a 04 reg factory turbo 115 hp as Standard, wouldn’t look at the old two valves which were being tb turbo at the time, only way to make it compete was to chip the tractor! To bring it up to the 140 horse which a lot of the two valves Tb turbos were running at

 

[Mark C]

What year did they change to common rail? Might be looking for one later in the year and it pays to know these things, cheers

I have just bought an 03 6920s. When I initially enquired I thought it was 2valve non common rail but it’s definitely common rail. Must be one of the very first.

 

[KB6930]

Yeah theres an 03 6820 next door to me that's common rail . Pulls very well .

My best pulling JD's have all been from 05 we had a 6420 6920 and a 7820 all 05 55 plates we've never had anything since that would touch them

 

[Phil P]

Apologies, just had a look and the change was 03/04 not 04/05 . It is nearly 20 years ago to be fair

 

[Mark C]

Apologies, just had a look and the change was 03/04 not 04/05 . It is nearly 20 years ago to be fair

Must admit I thought along the same lines as you. And got it checked by the dealer as was very close to the changeover.

 

[Mark C]

Yeah theres an 03 6820 next door to me that's common rail . Pulls very well .

My best pulling JD's have all been from 05 we had a 6420 6920 and a 7820 all 05 55 plates we've never had anything since that would touch them

I have been giving this one a bit if a birthday as it wanted a few little jobs doing. Put it on the dyno and it was putting out 170hp at the shaft ! Pump untouched from the factory. Further investigation showed that the injectors were past their best and it was over fuelling. But the bullet and treated her to a fresh set. Runs even sweeter now. Hoping to get it back on the dyno soon.

 

[KB6930]

I have been giving this one a bit if a birthday as it wanted a few little jobs doing. Put it on the dyno and it was putting out 170hp at the shaft ! Pump untouched from the factory. Further investigation showed that the injectors were past their best and it was over fuelling. But the bullet and treated her to a fresh set. Runs even sweeter now. Hoping to get it back on the dyno soon.

A lot of folk go on about the 30 series pulling well but a 6920 went every bit as well with no mythical power boost . My 7820 is bloody good 6.8l engine supposed to be 185 hp but will eat every 250hp demo tractor I've ever had on the place

 

[Sharpy]

I have been giving this one a bit if a birthday as it wanted a few little jobs doing. Put it on the dyno and it was putting out 170hp at the shaft ! Pump untouched from the factory. Further investigation showed that the injectors were past their best and it was over fuelling. But the bullet and treated her to a fresh set. Runs even sweeter now. Hoping to get it back on the dyno soon.

My 6620, untouched factory spec 4 valve common rail was dynoed at 150 hp, some output for an engine supposed to be 125 at the crank.

 

[Phil P]

My 6620, untouched factory spec 4 valve common rail was dynoed at 150 hp, some output for an engine supposed to be 125 at the crank.

Peak hp at the engine will have been a little bit higher on a 6620 out the factory probably closer to 140. That’s peak not rated. They usually make a bit more once they get a few hours under there belt.

 

[Flat 10]

My 6620 common rail feels very lively and pulls well on the road. But compared to my 6920 or even my 6810 pulling a cultivator it doesn’t hang on at all and needs plenty of revs.