278 driveline change update

Russ Phelan
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02 Sep 2014 18:31 #1 by Russ Phelan

Russ Phelan created the topic: 278 driveline change update

Here is a few pic of whats going on in my shed at the moment. A-frame constructed thru cab to remove engine. Worked well.

Perkins out.

Isuzu ready for clutch and gearbox. I will then raise both up under the truck. The Isuzu fan fits perfectly in the OKA fan shroud so this will be the datum point for the position of engine and gearbox mounts.

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Outback Jack
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02 Sep 2014 20:01 #2 by Outback Jack

Outback Jack replied the topic: 278 driveline change update

Looks great.

Love the idea of an Isuzu

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Russ Phelan
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29 Oct 2014 18:34 - 29 Oct 2014 18:48 #3 by Russ Phelan

Russ Phelan replied the topic: 278 driveline change update

more pictures of Isuzu engine into OKA. Still a few little things to sort but getting there.

Cable gear shift

Isuzu 6spd manual to Rockwell. Not enough time before Tassie trip to configure Nissan transfer box. Will do that next year.

Front diff got a birthday. full strip. new inner and outer axle seals, flexible and steel brake lines, springless kingpin setup.

Both fuel senders were buggered. new ones fitted as well as some paint.

New air filter

Engine fits pretty good. Should be back on its wheels next week. Then its up with the rear end for wheel bearings, brake lines and calipers.

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Last Edit: 29 Oct 2014 18:48 by Russ Phelan.

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Outback Jack
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29 Oct 2014 19:42 #4 by Outback Jack

Outback Jack replied the topic: 278 driveline change update

Real nice,

Will be interesting to see how it goes.

Looks like it all went in smooth enough....

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DarrenWebster303
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30 Oct 2014 17:19 #5 by DarrenWebster303

DarrenWebster303 replied the topic: 278 driveline change update

Russ, as I said from early on, I think this will become the go to conversion for Oka's. Cost effective, reliable & enough power, but NOT too much power for the standard drive line. I watch with interest......

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Russ Phelan
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30 Oct 2014 18:09 #6 by Russ Phelan

Russ Phelan replied the topic: 278 driveline change update

As you can see from the pics this engine isn't intercooled. It has 110kw (148hp) 400Nm (300lb/ft). With intercooler it jumps to 130kw (175hp).
Iv'e done all the work myself and I will add up the cost when i've finished but i reckon less than $10,000. There were a few tricky things but i have made a lot of notes and recorded parts used. If I had my time again I would buy a wrecked Isuzu rather than just an engine and box.

Future mods. are nissan transfer, intercooler(maybe), paint the cab.

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DarrenWebster303
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31 Oct 2014 19:32 #7 by DarrenWebster303

DarrenWebster303 replied the topic: 278 driveline change update

Isuzu transfer Russ. It will bolt straight on to the back of the box and all be factory. It's just shafts (cheap) from there.

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Peter and Sandra OKA 374
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01 Nov 2014 04:56 #8 by Peter and Sandra OKA 374

Peter and Sandra OKA 374 replied the topic: 278 driveline change update

Darren sort of raises a good point Russ as the engineer I've spoken to will not sign off on a transfer case and handbrake from a lighter vehicle being used on the Oka. Stands to reason I guess as a GCM of 7t is a long way above what a Patrol is rated at.

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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Paul Scherek
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01 Nov 2014 05:10 #9 by Paul Scherek

Paul Scherek replied the topic: 278 driveline change update

I guess apart from the legalities there is also the durability issue. While the Nissan transfer can handle a lot more power than that Isuzu puts out, it does not expect to be doing it all the time. Punting an Oka along at 100 k's takes a lot more power continuously than the same speed in a Patrol. Most of the time the Patrol would not put much power through the transfer case but the Oka weight would load it heavily all the time.

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Peter and Sandra OKA 374
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01 Nov 2014 14:57 #10 by Peter and Sandra OKA 374

Peter and Sandra OKA 374 replied the topic: 278 driveline change update

The nissan box is very strong and there are quite a few that have been running in Oka's for quite a while without problems, Pete Fox's in a previous life was a tour vehicle which was heavily laden most of its life. Lots of comp trucks run them and don't seem to ever break them either. Plus with the extra low range gears they work well off road and have a great handbrake despite the illegality. The other alternative an NP205 has lousy low range gearing although they can be fitted with a doubler apparently.

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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DarrenWebster303
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02 Nov 2014 06:43 #11 by DarrenWebster303

DarrenWebster303 replied the topic: 278 driveline change update

Paul, The Nissan case drives straight through for the rear drive, so no load on the case unless you are in 4x4.
Peter, you forgot one, Atlas II, its on my wish list, but Im not sure about a handbrake solution on the Atlas II.

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outyonda
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02 Nov 2014 07:45 - 02 Nov 2014 08:02 #12 by outyonda

outyonda replied the topic: 278 driveline change update

this is a standard np205 case with HD internals & 6x6 shaft.

building & testing NP205 special T/C
wider for auto clearance & 3 speed. 1;1 2;1 3;1
watch this space, more to come!!

OKAs 091, 093, 094, 113, 346x6 & 405

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Last Edit: 02 Nov 2014 08:02 by outyonda.

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Outback Jack
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02 Nov 2014 08:15 #13 by Outback Jack

Outback Jack replied the topic: 278 driveline change update

Nice,

I spoke to the company for the hand brake and got them to spec one for the OKA.

Is this one of the shelf or made to suit the OKA?

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outyonda
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02 Nov 2014 08:35 - 02 Nov 2014 08:37 #14 by outyonda

outyonda replied the topic: 278 driveline change update

It's a Brett special.

I got one for np205 & sent it back, same dimensions as a Hilux!!

I built the yoke & 10" disc to fit flange & calliper.
have 3 for test drive,

OKAs 091, 093, 094, 113, 346x6 & 405

Last Edit: 02 Nov 2014 08:37 by outyonda.

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Russ Phelan
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02 Nov 2014 18:25 - 02 Nov 2014 18:35 #15 by Russ Phelan

Russ Phelan replied the topic: 278 driveline change update

Peter and Sandra James OKA 374 wrote: Darren sort of raises a good point Russ as the engineer I've spoken to will not sign off on a transfer case and handbrake from a lighter vehicle being used on the Oka. Stands to reason I guess as a GCM of 7t is a long way above what a Patrol is rated at.

I can see were the engineer is coming from but the hand brake i removed from the rear of the isuzu gear box is the same diameter as the nissan although it is 5mm wider.
A NQR450 from which my engine/box is from has a GVM of 8700kg and GCM of 12200kg!
The isuzu handbrake is on the left. The nissan one is missing the screw adjuster and a couple of springs. Almost identical.
Show the engineer that you have fitted a NQR450 handbrake to the back of the nissan transfer case. See what he says.

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Last Edit: 02 Nov 2014 18:35 by Russ Phelan.

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Russ Phelan
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02 Nov 2014 18:31 #16 by Russ Phelan

Russ Phelan replied the topic: 278 driveline change update

DarrenWebster303 wrote: Isuzu transfer Russ. It will bolt straight on to the back of the box and all be factory. It's just shafts (cheap) from there.

Yes that does sound a good idea. I will need to find out if the transfer case will bolt up to my gearbox with the rear extension removed or whether it was a specific box in the 4wd models. If i have to buy another box it will probably be auto. Finding a donor auto with transfer from a 4wd isuzu might be tough. But i will investigate further.

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Russ Phelan
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06 Dec 2014 18:17 #17 by Russ Phelan

Russ Phelan replied the topic: 278 driveline change update

I've been driving the truck around for a bit now and its really going well. Just a few little things so far( leaky t/stat housing) but easily sorted.
I found i had the wrong gear shifter. The H pattern was right to left. Drove it like this for a couple of weeks until the correct one arrived. Really had to think before changing gears to get the one you wanted.
Pulls well up hills, holds speed, no die in the arse.
Will be even better once intercooled.

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Outback Jack
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06 Dec 2014 18:53 #18 by Outback Jack

Outback Jack replied the topic: 278 driveline change update

Whats the fuel economy been like???

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The Worb
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07 Dec 2014 17:44 - 07 Dec 2014 17:44 #19 by The Worb

The Worb replied the topic: 278 driveline change update

Hi Russ,

What model and year Isuzu motor did you fit?

Cheers Brian

Last Edit: 07 Dec 2014 17:44 by The Worb.

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Russ Phelan
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08 Dec 2014 17:49 #20 by Russ Phelan

Russ Phelan replied the topic: 278 driveline change update

Outback Jack wrote: Whats the fuel economy been like???

No data yet as iv'e only been running around on a partial tank.
What I have noticed though is when sitting on the flat at 100k/h the exhaust temp reads just under 400deg. With the Perkins it would have been 500deg at that speed with the pedal pushed in deep. So I'm figuring its using less full for same speed???
I've filled up a tank and will calc. distance travelled as of next week on the trip down the coast to Melb. then on the boat to Tassie.
I'll attempt to report findings while away.

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