6bt cummins conversion

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16 Jan 2013 19:04 #1 by deedy
deedy created the topic: 6bt cummins conversion
Hi, I am currently doing a 6bt conversion in my oka. I am, trying to find a hydraulic/power steering pump to suit the oka and piggy back on to a wabco comressor with cummins 11 tooth gear. Does anyone have any sugestions? What flow rate and pressure is needed to replace the vickes hydrolic pump?
Thanks
Chris

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17 Jan 2013 09:08 - 17 Jan 2013 09:43 #2 by Outback Jack
Outback Jack replied the topic: 6bt cummins conversion
One option would be is to run an electric power steering pump.
A lot of cars have this fitted as standard now.

Here is a new kit

ELECTRIC POWER STEERING KIT

A quick look on ebay you will find used ones for around 200 odd dollars that come off MR2`s.

Not sure how they would go on OKA with brakes using same pump.

Here is a write up off a MR2 one getting fittied to a car.

Power Steering conversion

The other use for these pumps maybe for hydrualic winches etc etc.

Downside is they can draw a lot of current.
Last Edit: 17 Jan 2013 09:43 by Outback Jack.

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17 Jan 2013 13:10 - 17 Jan 2013 13:26 #3 by dandjcr
dandjcr replied the topic: 6bt cummins conversion
It's an interesting alternative but a simple fuse failure would leave you with minimal or no brakes (or steering) on an Oka.

I think I'd rather stick with the mechanical pump although a large pressure reservoir would be a useful addition so the brakes/steering continue to work for a while after the engine stops.

Are there such things? Answer yes, Hydraulic Accumulators . Has anyone looked into these for Oka applications?

David and Janet Ribbans - Oka 148
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Last Edit: 17 Jan 2013 13:26 by dandjcr.

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17 Jan 2013 13:46 #4 by dandjcr
dandjcr replied the topic: 6bt cummins conversion

deedy wrote: What flow rate and pressure is needed to replace the vickes hydrolic pump? Chris


Chris, I think the pump is a Vickers Eaton V10 model . You might find some useful data here and here .

David and Janet Ribbans - Oka 148
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17 Jan 2013 14:16 - 17 Jan 2013 14:18 #5 by PeteFox
PeteFox replied the topic: 6bt cummins conversion
Chris
For an LT
the hydraulic pump is a Vickers V10-IS4-S12-C20

The Oka specs are:
100 psi min at 750 r/min
1500 psi max at 2400 r/min
Nominal Flow 13.5 litres/min at 2400 r/min

I presume this is engine RPM. You may have to consider the actual RPM of the hyd pump on a Perkins and compare this to the compressor RPM on the Cummins in sizing the replacement pump.

Paul Nott has done this conversion, he should be able to put you on the right track.

The fluid is fed to the Hydroboost which has a small accumulator for the brakes which then feeds to the steering box.
According to the manual you should have two brake applications form the accumulator when it is fully charged with the engine stopped.

Pete Fox OKA266 MultiCab
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Last Edit: 17 Jan 2013 14:18 by PeteFox.
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17 Jan 2013 14:38 #6 by dandjcr
dandjcr replied the topic: 6bt cummins conversion
Pete, time for a dumb question. I don't have any residual brake or steering pressure, so either I don't have a "hydroboost" on my XT or it's not working.

Presumably it's part of the master cylinder? (I don't have a manual for that section).

Robin told me once I should have a couple of boosted pumps of the brakes available after the engine stops but I don't.

What could be wrong?

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17 Jan 2013 14:53 - 17 Jan 2013 15:01 #7 by Outback Jack
Outback Jack replied the topic: 6bt cummins conversion






All OKA`s have them. They are off a Chevy

Its Number 2 Below

Last Edit: 17 Jan 2013 15:01 by Outback Jack.
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17 Jan 2013 17:42 #8 by PeteFox
PeteFox replied the topic: 6bt cummins conversion
Dave
You definitely have a hydroboost. The accumulator is a non serviceable nitrogen filled cylinder on the side of master cylinder. Presume you're out of nitrogen, me too.

Pete Fox OKA266 MultiCab
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17 Jan 2013 18:36 #9 by deedy
deedy replied the topic: 6bt cummins conversion
Thanks Peter. I also assume that it is right hand or clockwise rotation. If it was a a slightly bigger pump would this cause problems?
Thanks
Chris

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17 Jan 2013 19:11 #10 by Outback Jack
Outback Jack replied the topic: 6bt cummins conversion
You can buy recon hyrdobooster from the States or Paul has them as well I think.

Not sure but Allan at OKA may have them as well. He would be the first place I would start.

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17 Jan 2013 20:03 #11 by Joseph Baz
Joseph Baz replied the topic: 6bt cummins conversion
Deedy,I have a complete 4BT up on the rack,will have a look tomorrow at the pump and see if can get you some details as this was a working OKA set up.
Cheers,Joe
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17 Jan 2013 21:01 #12 by dandjcr
dandjcr replied the topic: 6bt cummins conversion

deedy wrote: Thanks Peter. I also assume that it is right hand or clockwise rotation. If it was a a slightly bigger pump would this cause problems?
Thanks
Chris


Deedy, the current hydraulic pump is quite a tight fit under the injector pump so a larger one would be difficult to fit.

David and Janet Ribbans - Oka 148
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17 Jan 2013 21:18 #13 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: 6bt cummins conversion
The nitrogen cylinder is the anodised aluminium tube on the side of the hydroboost in the second pic of Jacks, can't remember that I've seen one on the Oka but lots of Chev trucks have them and so does my Humvee. On the Humvee it doesn't feel like it does much but when the pressure is discharged you realise it was doing something.

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.

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17 Jan 2013 21:22 #14 by dandjcr
dandjcr replied the topic: 6bt cummins conversion

PeteFox wrote: Dave
You definitely have a hydroboost. The accumulator is a non serviceable nitrogen filled cylinder on the side of master cylinder. Presume you're out of nitrogen, me too.


Thanks Pete, that would explain it. And there's no recharge valve?

Sounds like a larger external accumulator would be the better way to go, a similar principle to the one on my domestic water system pressure pump.

David and Janet Ribbans - Oka 148
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17 Jan 2013 22:25 #15 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: 6bt cummins conversion
They are about $us400 new on ebay, cost about $40 to post over

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.

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18 Jan 2013 05:49 #16 by Outback Jack
Outback Jack replied the topic: 6bt cummins conversion
Peter would know better than me, but I think Hummers have a similar set up. I think the master cylinder may be the same.

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18 Jan 2013 06:57 #17 by Joseph Baz
Joseph Baz replied the topic: 6bt cummins conversion
Deddy,the set up on my 4BT is similar to the Perkins,same pump bolted straight to the back of the timing gear housing,I sold Paul Nott a Wabco compressor that he fitted on his and he is got the Hydraulic pump pigging off the compressor,if you give him a call he will be able to help you out,I also have a Cummins ISB with a rear mounted Wabco compressor and the Hyd pump pigging off the compressor,If you can't get any help ,let me know and I will remove the pump and look at the gearing to see if it fits.
Cheers,Joe

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18 Jan 2013 09:25 - 18 Jan 2013 09:25 #18 by Outback Jack
Outback Jack replied the topic: 6bt cummins conversion

Peter and Sandra James OKA 374 wrote: They are about $us400 new on ebay, cost about $40 to post over


Peter are you talking about the Hydro booster?? If so do you have any links?
Last Edit: 18 Jan 2013 09:25 by Outback Jack.

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18 Jan 2013 10:18 #19 by PeteFox
PeteFox replied the topic: 6bt cummins conversion
Lobo
there are dozens of them here but it looks like there are a few different versions made for different vehicles and orientations

Pete Fox OKA266 MultiCab
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18 Jan 2013 12:03 #20 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: 6bt cummins conversion
The critical measurements are the four bolts to mount it, so you need the bolt spacing of the Oka one to get the correct one.

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.

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