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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 02-19-2011, 10:54 AM   #1 (permalink)
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flushing oil

Can anyone explain what flushing oil is and how it is used and what the benefit would be?

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Old 02-19-2011, 12:42 PM   #2 (permalink)
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Old 02-19-2011, 01:16 PM   #3 (permalink)
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Can anyone explain what flushing oil is and how it is used
Used to be normal practice to flush the engine out at an oil change. Flushing oil is a light oil with a lot of detergent in it. You drained the old oil hot. Refilled with flushing oil and ran the engine for 5-10 minutes under no load conditions and the engine at tick over or slightly above. After running, you just drain the flushing oil. It comes out absolutely black. A second application might be necessary if the engine has not been flushed for some time. Leave to drain well. You then just put in your normal low detergent 20w-50. Flushing oil is designed for classic engine without in-line filters such as Triumph twins.
Flushing oil is designed to "lift" any crud in the engine and hold it in suspension so that when you drain the oil, he crud comes out with it. Ideal for engines such as Triumphs as it should clean out the sludge trap provided the crud has not become too solid.
Widely used in the UK in the 50's and 60's by the typical owner/mechanic (most of us could not afford to use a dealer). Cannot remember anyone talking about the "sludge trap" as being an issue. Seems to be a US thing and I suspect the reason being that Flushing Oil was not in common use in the USA.
Flushing Oil was unobtainable for many years but is now available again. See http://www.morrislubricantsonline.co...p?idproduct=80
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Old 02-19-2011, 03:26 PM   #4 (permalink)
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Thanks for the answer epynt1050,I`d like to ask another question.

The workshop manual states that if flushing oil is not available ,kerosene can be used.

What is your opinion on the use of kerosene?

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Old 02-19-2011, 05:22 PM   #5 (permalink)
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Personally, I'd be concerned about using kero for anything but filling and draining again. It does have some lubricative properties, and certainly has solvent properties. But I'd be wary about running the engine with Kero in the crankcase. To me, it seems too light to produce a decent oil wedge in any plain bearing.

I would think that with today's modern detergent oils, flushing oil is really not required. Weren't the straight weight oils used in bikes back in the 50's and 60's non-detergent? That would make cleaning out the sludge a requirement I would think.

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Old 02-19-2011, 06:23 PM   #6 (permalink)
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I would think that with today's modern detergent oils, flushing oil is really not required. Weren't the straight weight oils used in bikes back in the 50's and 60's non-detergent? That would make cleaning out the sludge a requirement I would think.

regards,
Rob
That would be right Rob. RR
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Old 02-19-2011, 06:32 PM   #7 (permalink)
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Personally I can`t for the life of me see using kerosene,the feeling being that it would actually do more harm than good.
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Old 02-19-2011, 09:39 PM   #8 (permalink)
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The bit about kerosene is true, but...........the old trick was to drain a quart of the old oil and add a quart of kerosene, then run the engine for a while before draining it. Some folks used (and some still do) a quart of automatic transmission fluid for a small time before changing the oil. I too believe that modern oils have pretty much eliminated the need to use a flushing oil. However, if one drinks a quantity of castor oil..........there will be a considerable amount of "flushing" that will follow!!!

Sorry, the "village idiot" just couldn't let that one "pass" (pun intended): Jim
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Old 02-20-2011, 01:54 AM   #9 (permalink)
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However, if one drinks a quantity of castor oil..........there will be a considerable amount of "flushing" that will follow!!!

Sorry, the "village idiot" just couldn't let that one "pass" (pun intended): Jim
You had to bring that up didn't you Jim.

I recall from my childhood being given a medicine glass of castor oil to swallow as punishment for minor infractions of house rules. I can still taste it to this very day. Yuuuuuuuuuuuuk. RR
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Old 02-20-2011, 05:44 AM   #10 (permalink)
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Multi weight detergent oils came into widespread use in the late sixties if I`m not mistaken.Based on that info alone the assumption would be that bikes of that era and the newer ones especially would not show signs of sludge buildup in the sludge tube,yet time after time we read on one thread or another that someone has taken the tube out of their crank only to find significant amounts of crud inside.How can this be? The most likely explanation in my opinion is the lack of adherence to the 1500 mile oil change interval by previous owners.
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