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Old 26 November 2009, 18:46   #51
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James, take care when you swop out the engines. Some of those marinising parts are very expensive. In particular the phosphor bronze raw water pumps are about 600 each which is why they can run out of water for 5 minutes.

Pete
Cheers Pete - I'm not proposing to do the swap myself (if nothing else, the wiring loom has melted so will also need replacing - not sure if this will have to be rebuilt from scratch), but will definitely pass that on to whichever long suffering mechanic gets the job!

I am considering sending all three engines to Mermaid and requesting they build me one working one and keep the rest...
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Old 26 November 2009, 20:22   #52
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let me know if you need a hand with the loom.
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Old 27 November 2009, 07:54   #53
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may be worth doing a little modification to the new engine.
I have seen large petrol engine throttle bodies fitted to tractor pulling engine turbos intakes linked to the engine stop, so operation the stop shuts off air supply too.
In fact you used to be able to get an excess flow air valve made by Chalwyn who made the road lamps, when the engine over revved by any significant amount they shut off the air supply. they also protected against overboost too as they were operated by the air flow.
The main use for them was any diesel application where you couldnt stall a runaway, ie generators hydrostatic driven plant etc.
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Old 27 November 2009, 07:57   #54
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You can still get themhttp://www.chalwyn.co.uk/EN/auto_air_intake/aisv1.html
Automatic overspeed air intake shut down (shut off) valves with automatic reset

CHALWYN D SERIES VALVES

Simple cost effective fully automatic engine overspeed protection valves requiring no mechanical or electrical connections. Models available to meet virtually all popular combinations of intake pipe sizes and engine rating.
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Old 27 November 2009, 08:06   #55
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may be worth doing a little modification to the new engine.
I have seen large petrol engine throttle bodies fitted to tractor pulling engine turbos intakes linked to the engine stop, so operation the stop shuts off air supply too.
In fact you used to be able to get an excess flow air valve made by Chalwyn who made the road lamps, when the engine over revved by any significant amount they shut off the air supply. they also protected against overboost too as they were operated by the air flow.
The main use for them was any diesel application where you couldnt stall a runaway, ie generators hydrostatic driven plant etc.
I removed a quick warmup flap from the exhaust of my 3.1 TD Trooper a couple of months ago when swapping out a length of exhaust pipe. If you had a Vacumm pump on the engine (which you should) then this could be converted into an inlet shut off valve quite easily. It's free too
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Old 27 November 2009, 08:11   #56
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I removed a quick warmup flap from the exhaust of my 3.1 TD Trooper a couple of months ago when swapping out a length of exhaust pipe. If you had a Vacumm pump on the engine (which you should) then this could be converted into an inlet shut off valve quite easily. It's free too
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Old 27 November 2009, 08:36   #57
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its the same as the one i took off my isuzu 2.8td the butterfly probably wont seal properly or close completley enough to stop a runaway diesel
it would certainly slow it down though but you would need to block the little hole!
i guess though its a tad small for the intke on a 6.0 diesel which should really be 3"
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Old 27 November 2009, 09:54   #58
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I may be completely wrong but I think old spice already has an air intake cut off connected to the kill cord (from vague memory of previous Pac22/Old Spice threads). Presumably she had gone bang by the time anyone realised there was a serious problem!
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Old 27 November 2009, 10:24   #59
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Presumably she had gone bang by the time anyone realised there was a serious problem!
All the more reason to fit an automatic chalwyn one then
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Old 27 November 2009, 10:38   #60
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its the same as the one i took off my isuzu 2.8td the butterfly probably wont seal properly or close completley enough to stop a runaway diesel
it would certainly slow it down though but you would need to block the little hole!
i guess though its a tad small for the intke on a 6.0 diesel which should really be 3"
Your right, it's only a 2" bore. I guess it's smaller than the exhaust on a Pac22 too?

I recon you'd do better by fitting a hinged spring loaded plate over the air intake and pulling a lever to release this in case of a problem if you wanted the cheap solution.
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