Other Stuff > Tricks & Tips
Wots goin’ on here pls folks?
K2-K6:
--- Quote from: Oddjob on February 27, 2021, 07:04:07 PM ---I'm sat here wondering what the small trench cut into the barrel housing is doing. It runs almost the entire length of the barrels but doesn't appear to have an exit just an entrance, shame the head is so crusty as it may be hiding the exit. The small mod and filler could be to deal with a leak from that trench, was going to say waterway but it could be something else, like an oil passage running next to the water jacket to keep the oil cooler, if there was a leakage between the 2 maybe the filler was there to stop it.
Any idea what that feature is connected to?
--- End quote ---
I was wondering too, but looks like the port you see could be a chimney out of a chamber running underneath that "trench". If water came in at t'other end then crossed the block around the exhaust ports, it could then come up the chimney and out via the heads.
Possibly it'd give quicker combustion chamber warm up (leaving barrels alone) to get it off choke faster.
Lobo:
Wow Nigel, I reckon you might have hit the nail on the head with your sacrificial anode - I’ll go about looking for a zinc M6 bolt thingy and fit it regardless. Thank you. (And for your thoughts on Hylomar).
Ken, that trench is a dead area as it were, and is not used in oiling / cooling - maybe just an “is what it is†of casting?
Anyways, the hot water from the block / jacket exits via the bulged area (LHS previous photo) up into the thermostat housing. From there it is it then channelled down the length of the cylinder head (the head gasket being one side of that channel) before descending back into the oblong hole (R of previous pic) and out into the exhaust. (From here it goes down the leg and out through the centre of the prop)
FYI the head not yet been cleaned up!
Thanks again gents, really appreciate this site.
Simon
Lobo:
Ta da! You should have been a detective!
Ordered...
K2-K6:
--- Quote from: Lobo on February 27, 2021, 10:16:54 PM ---Ta da! You should have been a detective!
Ordered...
--- End quote ---
Ha ha, good result then and answers the question of mystery bolt.
I had the good fortune at initial training during apprenticeship to have some very lucid outlook people teach me, significantly influenced by aaib farnborough. So in a way metallurgical detectives.
Lobo:
...Nige - you ever meet Phil Gilmartin (RIP) AAIB / Farnborough?
PM if ya did...
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