Clutch plates

It could be silt in the block or a partial rad blockage. If a good flush doesn't work then you could dig a core plug out and see what's behind it, the ones near the starter and behind the flywheel are favourite for leaking because of the crud that builds up behind them:(
 
Well it was a luvly weekend as it turns out - hope was as nice for everyone else. Although I did have this overheating on my mind.

Just had a chance to take a look see. Stuck the garden hose on the radiator - seems to have a good flow through top to bottom - can't see any obstruction here. Feels uniformly hot all over as far as I can tell and both feed and return pipes are hot. Same goes with the flow through the engine. Water flows freely though. Took her on a run up the road, literally 2 min spin and she's overheating, and I mean happy to to creep right up over red if I let her..

At a loss. Still running great though but very very hot.

The coolant water was really red and slimey when I first started working on it. I have no experience of overheating like this so no idea how bad a potentially silted up block could be... nor if the mixture or timing being out could course such drastic heat build up. It starts on the button after sitting all weekend and pulls great.
 
I had exactly the same issue on Harvey's original engine. Had the rad re-cored, re-built the engine with a rebore and crank grind, new oil pump and it still overheated:( The only thing I didn't do was get the block dipped and chemically cleaned so I put it down to gummed up waterways. Commeracer cut a block open once just to see what was what and the amount of silt that had built up in there was scary. I know it sounds drastic but if a chemical flush doesn't work then it might be worthwhile digging the core plugs out to scrape and hose the crap out - the red stuff is corrosion products so it's been run on plain water for a period by the look of it.
 
Sorry to be a bit gloomy but when you find out a plastic bag stuck to the radiator you can call me all the names you like;)
 
Over the years I've had a few engines silted up around the back of the rearmost cylinder, including the Perkins in my Commer. Sometimes there's a drain cock for the block right at the back of the engine. You can connect a pressure hose to that and blast through the back of the engine.:) On one I drilled and tapped a hole through into the water jacket and used that to blast water through, then tapped and plugged the hole. As Panky says, you might be able to lever out a core plug and get at it that way, or you might have to pull the head:( Best to eliminate all the simpler things first though, like a slack fan belt, or impeller loose on the water pump, or flies in the radiator core, or radiator fins flaking away.

Magic flushing compounds work to a certain extent, but if the muck is thick, then it's mechanical disturbance, like water jets or bits of wire that will get it shifted.

Good luck.
 
recently had my block rebuilt...when the core plugs came out the rear had silt half way up the hole, most was casting sand according to the builder, it ran near the red but never overheated, it now runs at about 2/3 up the dial.
 
Bloody hell!!

Thanks for all the pointers guys.

I flushed the system twice yesterday with cleaner, gave it an overnight soak in vinegar for good measure. Replaced the rad with Charlie's... still running very hot but perhaps marginally better.

Got some oxalic acid coming tomorrow and some core plugs - wish me luck.
 
well I grasped summit :confused:

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The silt isn't past the bottom of the plug but there's a lot in there... found the issue??
 
Certainly not going to help, pop the other one out and get a length of stiff wire and a hose pipe in there. Better get some doc leaves as well;)
 
yuk! Looks like Swarfega! Yee defo get that lot out guess could be affecting the water pump. Hopefully the flush and coathanger will help, good luck
 
That's 'orrible. It might take a lot of flushing to get the larger bits out

I've found that the core plugs I've bought recently are thicker than older ones and more difficult to bash in. I always use a smear of silicone around the inside of the hole to make a good seal every time.
 
I hate to say it:oops: but it would be a good idea to drop the gearbox and flywheel to get at the rear plug too - there I said it
 
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