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Post  OVERLORD on Thu Jun 20, 2019 1:57 pm

I bought this electric Jerobee a few months ago for 30 EUR incl postage. I still have some spare parts so why not transform and put together a new cox powered one. The body is in good nick. It represents a 2nd series Canam racer on the Lola F5000 chassis. I don't know what car make it is though. if anyone's got an idea...

This car was raced and sponsored by the local Volvo garage. The standard grey chassis was upgraded with Lightning 2000 parts; an advantage of the Jomac produced cars. The rear axle, bearings, front bumper and wheels were all replaced.  The body is not a Jerobee one. Maybe Parma?

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A picture taken from the underside. The car has a lightened chassis, to say the least.

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With the body removed. Everything is still there except for the batteries. The worn front tyres have a nice taper from high speed cornering with worn front axle bushings.

Jerobee electric to glow conversion nr 2 Imgp5536

Jerobee electric to glow conversion nr 2 Imgp5537

Jerobee electric to glow conversion nr 2 Imgp5535

It's time to dismantle!!
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Post  Davenz13 on Thu Jun 20, 2019 2:02 pm

What a cool project.
I look forward to seeing it progress.
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Post  getback on Thu Jun 20, 2019 3:35 pm

That's a pretty cool car , wonder why the front tires are so skinny , looks like a dragster Shocked Are you going with TD or Bee ?
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Post  OVERLORD on Fri Jun 21, 2019 3:51 am

getback wrote:That's a pretty cool car , wonder why the front tires are so skinny , looks like a dragster Shocked  Are you going with TD or Bee ?  

The choice of the engine dépends on the driven gear I have. I still have a 56T gear for a Babe Bee. I believe the TeeDee powered cars have 58T gears. I don't have a spare engine with flywheel and clutch but can borrow the unit from the Corvette. The front tyres are mostly worn out and are ready for the bin.

Jerobee electric to glow conversion nr 2 Imgp5623

Jerobee electric to glow conversion nr 2 Imgp5622
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Post  getback on Fri Jun 21, 2019 8:18 am

Man them is worn out !! i am sure either one will put light to the rear wheels Devil
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Post  OVERLORD on Sat Jun 22, 2019 11:05 am

Rear axle disassembly

The rear wheels are mounted on a Lightning 2000 round shaft and fixed by a nyloc nut. The motion is transmitted by a roll pin fixed to a flange which is locked to the axle by a grub screw on a flat. The Jerobee wheels were modified by inserting a brass bushing and extra holes for the roll pin.

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On the right side is the differential. The axle slides out on this side.

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The plastic split bearings were replaced by ball bearings. These are thicker and the chassis needs to be drilled out a bit.

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Jerobee electric to glow conversion nr 2 Imgp5631

The chassis needs to be cleaned to remove dirt and glue. To brace the radio gear, foam patches were stuck in the middle.
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Post  roddie on Sun Jun 23, 2019 10:19 am

Hi Lieven, That's quite a project that you're undertaking. If anyone can get it done; it's you! I'd noticed that most of the Jerobee/JoMac glow-powered chassis' that I've seen, have a left-side drive-axle. This would naturally be dictated by the Tee Dee engines.. but the reed-valve variants are also left-side drive. I see that this elec. chassis does not have provisions for a left-side drive-axle. Is this why you're choosing to run the reversible-rotation reed-valve engine?

Jerobee electric to glow conversion nr 2 Dsc00710
Jerobee electric to glow conversion nr 2 Jerobe10


Last edited by roddie on Sun Jun 23, 2019 10:25 am; edited 1 time in total (Reason for editing : added photos)
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Post  OVERLORD on Sun Jun 23, 2019 10:47 am

Roddie, as you pointed out, the glow powered cars have the drive on the left and the electric cars have the drive on the right. The chassis remains the same, equipped with the standard hexagonal rear axle or with the upgraded Lightning 2000 rear axle. I will not reuse this axle with diff and wheels. The drive will be again on the left side with a hexagonal axle and wheels that fit. That's what's so interesting on these cars: a lot of stuff can be modified and/or upgraded. I think that in the second half of the 70's, when electric driven 1/12 cars became popular, many Jerobees were transformed from glow to electric because it was ever so easy to do so.
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Post  roddie on Sun Jun 23, 2019 2:18 pm

The modular design is definitely a plus+ Thumbs Up I have documented (photos) most every Jerobee/JoMac project that you've done.. and saved some random photos from elsewhere on the inter-web too. The models fascinate me.
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Post  getback on Mon Jun 24, 2019 2:41 pm

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Post  OVERLORD on Tue Jun 25, 2019 10:11 am

Front wheels

I took off the front wheels from the stub axles. On the left side extra washers were found. On the right side, washers were replaced by a spring. The brass bushings in the centre of the wheels are worn. I tried to remove them with a bolt / washer and tube but they didn't move at all. They were possibly glued in place when the 2 wheel halves were bonded together.

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And the cleaned chassis:

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I must say that these Jerobee chassis are very well made and of the right material. This is the 3rd chassis I'm working on and I never saw any warps, or cracks or brittleness knowing that these cars were used and abused and that they have an average age of 45 years!!
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Post  getback on Wed Jun 26, 2019 7:07 am

The chassy does look very well built and like you said of the right material , You got that thing gutted , see you already have replacement wheels. Tires ? Small Cox Logo
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Post  OVERLORD on Thu Jun 27, 2019 2:47 am

The white front wheels are the ones that were on the car, only cleaned! For tyres, I will use the Jerobee rubber front tyres. They fit the rimmed wheels.
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Post  OVERLORD on Wed Jul 10, 2019 1:14 pm

Rear axle assembly

The 1/4" round Lightning 2000 rear axle cannot be used for glow power. To fit the gear and wheels, a hexagonal axle is needed. The difficulty is to insert such an axle when the chassis is equipped with ball bearings. This axle only has round parts where the plastic bearings go. They are split and need to be pried open and fit in place after inserting the axle in the chassis.

But the Jerobee guys made an adapted axle to fit the ball bearings. This axle is made out of 2 parts that screw together after being mounted from both sides. This gives an axle that is round in the centre part.

I have a Jerobee axle and a Bolink axle. The Bolink one doesn't use E clips to hold the wheels but domed screws and washers.

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The half axles are both drilled and tapped. A threaded stud was then inserted. I assembled both shafts and the match is incredible. No joint is visible or can hardly be felt. The Bolink axle is a bit shorter than the Jerobee one.

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I fitted the Jerobee axle to the chassis. It turns very smoothly.

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Post  OVERLORD on Wed Jul 17, 2019 3:49 am

To complete the rear axle, I mounted a new 56 teeth gear and on the right side the spacer I was looking for for a while. I found and bought a Jerobee parts lot on EBay. This cost me 4,5 EUR. I was the only bidder. The purchase price need to be multiplied by 4 to get it to my home but compared to other sales going on, this was still reasonable. In the parts lot was a axle replacement kit with plastic bearings and the spacer, rear Wheel E clips (always useful!) and a Lightning 2000 gear.

Jerobee electric to glow conversion nr 2 Lot_wi10


The wide rear wheels without tyres are a spare wheel kit sold by Jomac. I mounted a pair of hard Twinn K AJ's.

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Jerobee electric to glow conversion nr 2 Imgp5641
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Post  getback on Thu Jul 18, 2019 4:17 pm

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