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Messages - dieselspanner

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1
Reversing the engine was common on earlier marine diesel engines with the propellor shaft permanently coupled to the crank shaft. the engine was stopped, the cam shaft was moved to the other set of cams, by sliding it back and forth in its bearings and the engine restarted with compressed air.

A mate of mine started work on small coasters around the UK in the early '60's and this arrangement was common. As they were hard worked and under maintained old ladies the supply of air was limited by the ancient compressor's ability to keep up with the demand, so the skipper had to use the minimum of helm orders to maneuver in harbour, with each order, ahead, astern and stop requiring a restart.

See this link for details of reversing the Villiers motors in the Bond mini car

 https://en.wikipedia.org/wiki/Bond_Minicar

It doesn't mention it, but from memory, I believe they had a second set of points as well.

Cheers
Stef


2
Other Slow Speed Diesels / Re: Southern Cross ETB diesel engine
« on: March 23, 2019, 07:35:40 AM »
Hi Bob

If the engine will run on without repairing the piston I'd be inclined to leave it alone.

Whilst there's every chance the repair will hold, if it does detach it's self (incompatibility of metals, thermal shock and stuff like that) a chunk of metal flying around the upper cylinder is going to play the cat and banjo with the valves and bore.

'swot I fink, anyway......

Cheers
Stef

4
General Discussion / Re: Smoke billowing out of intake.
« on: March 22, 2019, 05:07:23 PM »
The short answer is probably 'timing'

the longer one is that when it hit the compression stroke it bounced back just after the injector popped, when it went all the way around, almost two revolutions to the compression stroke from the other side it fired, passed TDC and continued to run.

The injector would have popped, albeit in the wrong position and the sequence repeated it's self.

Without a lot of thought, for which I don't have time, 'cos I'm off up the pub in a few minuets, there's probably less charge air when the motor runs backwards, leading to an overfueling situation, hence the black smoke.

Check the timing, and if that's ok crank harder to get it past TDC in the correct direction!

Cheers
Stef

5
Other Slow Speed Diesels / Re: Southern Cross ETB diesel engine
« on: March 19, 2019, 08:33:33 PM »
Looking good!

Cheers
Stef

6
Other Slow Speed Diesels / Re: Southern Cross ETB diesel engine
« on: March 01, 2019, 07:02:44 AM »
Well done with the easy out, takes a level of calm and skill I struggle to attain!

Best of luck with the hands.
Stef

7
Petteroids / Re: PETTER - PAZ1 - New project
« on: February 25, 2019, 07:10:14 AM »
Nice work, SP.

I've all the bits to make one for myself, all I need is some time.......

Cheers
stef

8
Generators / Re: Tensioner or Rail mounting.
« on: February 21, 2019, 07:16:52 AM »
I mounted my genhead with slots and a couple of 10mm bolts tapped into tags, welded to the rails to act as tensioners. It took a few minuets extra whilst knocking up the frame, makes tensioning and more importantly parallel alignment easy. After adjustment I locked them into position with a plain nut.

Cheers
Stef

9
Other Slow Speed Diesels / Re: Another shop project
« on: February 20, 2019, 07:11:45 AM »
Good to see, great work, thanks for posting.

Cheers
Stef

10
Other Slow Speed Diesels / Re: Southern Cross ETB diesel engine
« on: February 18, 2019, 03:06:08 PM »
Years back I read something to the effect of....

 'How amazing would it be if there was another sentient life form out there, somewhere. How amazing would it be if there wasn't?'

Cheers
Stef

11
General Discussion / Diesel!!
« on: February 16, 2019, 03:58:40 PM »
I don't know if this short movie has been mentioned before, anyway I was led this way whilst wandering further thro' the WWW.

https://www.youtube.com/watch?v=GMdLbPS9R20&feature=related

Cheers
Stef

12
General Discussion / Re: Unexpected panel problem.
« on: February 14, 2019, 08:27:45 PM »
Perhaps not as weird as it might seem, once the wind got under the panel there would have been a massive force upward from just a little pressure.

It looks like later in the year I'm off to the UK to commission a new hover barge, with a 150 tonne payload, The whole thing runs on less than 1 psi, or 0.07 bar, pretty standard for most hovercraft.  When one considers that it's planned to be 52.5 m long by 25 m wide that's a lot of square inches - 2,027,800 or so!

I'd guess, as you said, the position on the roof and the surrounding panels etc. had a lot to do with it, add in a low pressure area caused by the wind direction and the shape of the roof it's self you've got some mighty forces to contend with....

Cheers
Stef

13
Petteroids / Re: PETTER - PAZ1 - New project
« on: February 09, 2019, 08:59:45 PM »
Belt, braces, and a bit of string,
Any doubt left, add a safety pin.

Having had a large portion of my career at sea, the word 'preventer' is never very far from my mind when setting up something that is going to cause me untold grief when I cock it up in my usual cavalier fashion.

NASA came up with 'fail safe' and 'fail soft' quite a few years back, deep sea sailors had been doing it for centuries.

And I've still got most of all of my fingers......

Cheers
Stef

14
Other Slow Speed Diesels / Re: Another shop project
« on: February 09, 2019, 06:44:28 AM »
Once again, nice work, I envy you the chance to go against the more usual time = money and ugly, and function over form.

Cheers
Stef

15
Petteroids / Re: PETTER - PAZ1 - New project
« on: February 08, 2019, 10:10:30 PM »
There are 4 'rods', assuming they are only 16mm, the nominal working load, in tension, is around 800 kg each, multiply by 4 = 3.2 tonnes safe working load, they ain't going to get broke by that 5 tonne Chinese jack, even allowing for uneven loading.

If there's a bigger jack involved only one will let go, after it's bounced off the ceiling there won't be too much drama! re drill for 20mm studding and try again.....

Cheers
Stef


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