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Old 10-02-2017, 11:58 PM   #661 (permalink)
Aero Wannabe
 
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Location: NW Colo
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TDi - '04 VW Golf
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Cool project. I bought the magazine in '82 but never built a Centurion. You are getting some amazing mileage with 35 year old technology.

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"I worked on the wiring to see if I could get the alternator to charge. The stud was loose and I accidentally let the white smoke out of the box... Alternators, among other things, run on white smoke. Once you let the white smoke out they no longer work!" planejob
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Old 10-07-2017, 09:48 PM   #662 (permalink)
Changfa diesel + Suzuki
 
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Centurion - '74 FIAT X1/9 Centurion Full Race DNA
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Replacing the Original Centurion's water pump.
The original water pump is externally mounted on this Kubota D750.
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A Quick Recap:
This particular early Kubota D750 was thermosiphon cooling which would not have been adequate for this application. So, to address this, R.Q. Riley added a water pump and thermostat.
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The water pump itself is still relatively cheap if purchased brand new (under $25 USD). And the thermostat is about another $7.
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In the last photo you can also see a new oil filter (it's red). While the water pump was off, I replaced the original Kubota oil filter.
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Another project done.
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~CrazyJerry~
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Old 10-08-2017, 04:14 AM   #663 (permalink)
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Topoff (RIP) - '92 Geo Metro LSi
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Interesting. I'd better confirm my D905 doesn't have such a water pump setup...
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Old 10-29-2017, 03:58 PM   #664 (permalink)
Changfa diesel + Suzuki
 
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Centurion - '74 FIAT X1/9 Centurion Full Race DNA
Last 3: 143.5 mpg (US)
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Quote:
Originally Posted by Stubby79 View Post
Interesting. I'd better confirm my D905 doesn't have such a water pump setup...
You should be ok - this thermosiphon setup was found on early Kubota engines. They have since included standard style water pumps on these engines.
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Old 10-29-2017, 04:05 PM   #665 (permalink)
Changfa diesel + Suzuki
 
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Join Date: Jul 2012
Location: Northern, NY
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Centurion - '74 FIAT X1/9 Centurion Full Race DNA
Last 3: 143.5 mpg (US)
Thanks: 150
Thanked 410 Times in 220 Posts
Replacing the original Centurion's radiator.
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Due to age and debris in the cooling system, the original radiator was in need of a replacement. Replacement radiators are more like "close approximate matches" which is good enough.
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With the new radiator in a test run was in order. No leaks and the little Kubota runs supreme!
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~CrazyJerry~

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Last edited by changzuki; 10-29-2017 at 08:34 PM..
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Old 10-30-2017, 09:24 PM   #666 (permalink)
Changfa diesel + Suzuki
 
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Centurion - '74 FIAT X1/9 Centurion Full Race DNA
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Happy Halloween!
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Old 11-19-2017, 06:57 PM   #667 (permalink)
Changfa diesel + Suzuki
 
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Centurion - '74 FIAT X1/9 Centurion Full Race DNA
Last 3: 143.5 mpg (US)
Thanks: 150
Thanked 410 Times in 220 Posts
Addressing the original Centurion's charging system.
Somewhere along the line, the wires connecting original Kubota dynamo to the rest of the car's electrical system were removed.
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In the hunt for these wires, it was also noted that the dynamo's voltage regulator was also missing.
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Using Kubota's factory wiring diagram, it was fairly easy to make a new wiring whip and connect it with the new voltage regulator.
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The story continues....
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~CrazyJerry~
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Old 12-06-2017, 07:37 PM   #668 (permalink)
Changfa diesel + Suzuki
 
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Centurion - '74 FIAT X1/9 Centurion Full Race DNA
Last 3: 143.5 mpg (US)
Thanks: 150
Thanked 410 Times in 220 Posts

-Centurion's oil filter-
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In the previous posts, the external water pump (and hardware) was removed for replacement. During this time it was discovered the original oil filter was still intact. With this easy access replacement of the original Kubota oil filter was next on the list but it was not without it's own little challenge!
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The auto parts store had a valid part number for a Fram oil filter replacement. Next to the original Kubota filter there is a small height difference - but it's enough to cause a problem - once installed, the filter contacts the shock tower.
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Back to the auto parts and this time I brought the original filter and spent some time comparing it to the ones on the shelf.
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Luckily a cheap Purolator was stocked and fit perfectly!
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New oil and filter... onward ho!
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~CrazyJerry~
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Old 12-24-2017, 10:42 PM   #669 (permalink)
Changfa diesel + Suzuki
 
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Centurion - '74 FIAT X1/9 Centurion Full Race DNA
Last 3: 143.5 mpg (US)
Thanks: 150
Thanked 410 Times in 220 Posts
For those who celebrate it:
Merry Christmas & Happy New Year!
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CrazyJerry~
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Old 12-27-2017, 07:56 PM   #670 (permalink)
Changfa diesel + Suzuki
 
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Centurion - '74 FIAT X1/9 Centurion Full Race DNA
Last 3: 143.5 mpg (US)
Thanks: 150
Thanked 410 Times in 220 Posts
The electrical system on the original Centurion needs attention.
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First on the list was a new ignition switch which is made exactly by Kubota as the original Centurion has. Easy peasy..
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Second was a bit more challenging. No lights, etc.... So all the rocker switches were removed, disassembled, and contacts sanded with 1500 grit paper.
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Now all the lights, etc, work. One of the strip lights added from the "Total Recall" movie still have a couple bulbs working.
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Now that the dash lights work it's easy to see that the gauges are all foggy from the inside of the lenses and will need to be either disassembled and cleaned or replaced...
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~CrazyJerry~

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