perkins HT 6.354 questions

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hdavetaxi

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Hi all

i have tod tornado with twin ht.6.354 engines
one is leaking either from main bearing or from the inspection hatch underneath
so we plan to remove and recondition this.
we have purchased another ht 6.354 engine that is the same era and spec
i am not sure however if the engine being removed is contra rotating on not
my questions are

is it possible that its the gearbox that gives opposite rotation instead of the engine itself
what is the difference between the contra and normal rotating engines. ie are parts all different

thanks for any advice

Dave
 
The engine number ended in a suffix for the contra rotating engine, cant remember what is was though. Check the engine numbers of your existing two .
Back in the day I was running them, Golden Arrow Marine were the Gurus might be worth giving them a ring.
If it has a contra rotating engines it is the engine not the gearbox giving the counter rotation
 
HT6 contra engine is different internally, cam and water pump, I think both gallery feed and scavenge oil pumps too. Think the CAV DAP pump is different too.

The guru on this engine now would be David Harrison, the technical man at the Broom Owners Club.

Beware, parts availability on the HT6 is now very poor.

I suspect fitted with BW Velvetdrive, while this box can run in either direction subject to correctly positioning the oil pump on the front, it cannot accept full power in both directions. That is to say, you cannot have a pair of anti clock engines with handed props using this box.
 
thanks for info folks

ive been very lucky
the engine i purchased to swap just happens to be the correct one
the other engine is a contra it has an x in serial number, its already been rebuilt and is all good (at the moment)
although this has left me with some concerns when it comes to needing parts.

thanks again

Dave
 
volvopaul said:
Anoter way is just turn the key and look at the crank pulley!
Click to expand...

I think its the replacement engine he is not sure about.
I thought it was an X that denoted a left handed engine but wasnt sure if my memory served me correctly or not. Long time ago since I trained with perkins
 
burgundyben said:
HT6 contra engine is different internally, cam and water pump, I think both gallery feed and scavenge oil pumps too. Think the CAV DAP pump is different too.

The guru on this engine now would be David Harrison, the technical man at the Broom Owners Club.

Beware, parts availability on the HT6 is now very poor.

I suspect fitted with BW Velvetdrive, while this box can run in either direction subject to correctly positioning the oil pump on the front, it cannot accept full power in both directions. That is to say, you cannot have a pair of anti clock engines with handed props using this box.
Click to expand...

Velvet drive 2:1 red has handing difference by adding a cog and this gives different reduction ratios 1:9&2:1 as I recall so props are not the same if the boat Is out the water easy to check ?
 
scottie said:
Velvet drive 2:1 red has handing difference by adding a cog and this gives different reduction ratios 1:9&2:1 as I recall so props are not the same if the boat Is out the water easy to check ?
Click to expand...

That is correct, there is a 72CR which allows common rotating engines to run handed props, however, I would be surprised if this is the case in a Tod Tornado, would think its 1:1 which there isn;t a CR version. (AFAIK - but happy to be corrected).

Sounds like a lot of cast iron for a Tod to me.

I'd be looking at a re-power.
 
hdavetaxi said:
Hi all

i have tod tornado with twin ht.6.354 engines
one is leaking either from main bearing or from the inspection hatch underneath
so we plan to remove and recondition this.
we have purchased another ht 6.354 engine that is the same era and spec
i am not sure however if the engine being removed is contra rotating on not
my questions are

is it possible that its the gearbox that gives opposite rotation instead of the engine itself
what is the difference between the contra and normal rotating engines. ie are parts all different

thanks for any advice

Dave
Click to expand...

Lots of good advice and very smart move to purchase spare engine.

Perkins contra rotating engine parts have been NLA for many years however the big deal is the scavenge lube oil pump.

Scavenge pump failures seems to pop up almost every month now and pumps like the contra parts are NLA and are blighting horizontal engines.

When you are changing engine out inspect your scavenge pump is in good shape and replace your rear main oil, they seem to have been designed to go hard and leak at even the most modest installation angle.
 
thanks for great advice folks

i did read somewhere that the scavenge pump could be replaced with a electric one
is this the case and if so can this be done without removing engine. i think the scavenge pump is ok but hearing how often they fail. it would be good to have a backup plan

thanks again
 
hdavetaxi said:
thanks for great advice folks

i did read somewhere that the scavenge pump could be replaced with a electric one
is this the case and if so can this be done without removing engine. i think the scavenge pump is ok but hearing how often they fail. it would be good to have a backup plan

thanks again
Click to expand...
Check out the mechanical pump against spec, if it is in good shape live with it.

Electric pump is another Lancing Marine bodge job.
 
I am having problems with steam coming from the exhaust on my HT6.354. I have checked and overhauled the fresh water side, pump header tank and tube stacks. I now suspect the Exhaust manifold. Have taken off the extension and turbo. Being reco'd. When I run water in the intake end, although I get water out there is still back pressure. I presume there should be none. Also some black scale coming out. I am planning to take the manifold off but very hard to get to bolts with them under motor and near hull. Can any one explain why there is a plate on the bottom of the manifold?? is this for inspection and cleaning??
 
i know the plate you mean, I suspect its there as the hole was how the foundry held the cores in place when they poured the iron to the sand. (Aside from knowing the 6.354 inside out, I work on design of iron castings)

The black scale is iron that's been rotted by the seawater. Check your charge cooler too, most of them are iron body with salt water in,
 
Thanks. The charge cooler has been removed and cleaned. Need to know if water should run freely thru ex manif. without back pressure before I spend another day trying to remove it. Probably have to remove my deepfreeze heat exchanger so I can lie down beside motor to get bolts undermeath. Wondered if removing this plate may assist me cleaning it out without need for removal?? Anyone??
 
First I would remove the plates on front and back of the manifold that are the water in and out, check those for corrosion and blockage.

I would not expect there to be any significant restriction to water flow through the manifold.
 
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