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Anon
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excessive oil use

Hello everyone, greetings from holland.

new on the forum here, I like to ask about our 79 hymer RV based on a Bedford 97300 CF. It has the 2.3L petrol engine which runs pretty well, however, it uses quite a bit of oil, say one litre every 1000km, or 2 pints every 600mls.

I have done the head with new seals and reseated the valves. Oil consumption is still there. It may sweat or leak a little around the distributor but I think the oil is consumed through worn piston rings. Compression is still within range, however when the head was of I could see some dragmarks on the cylinderwalls, probably from running hot...?

The engine does not smoke under load, as far as I can tell but does under high vacuum. I would like to hear from the experts if this is recognised as a worn engine? Not sure what to do about it. If I could find new overzise pistons, perhaps it is worth doing a rebore?

What is the wise thing to do here? It is tricky doing long trips I need to add oil at every other tank fillup.

Happy riding to all!
Mon 19 Dec 2016 @ 09:12 Edit this messageQuote this messagePMQuote this message
Anon
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Hello and welcome to the forum.
Are you using a mineral 15/40 or 20/50 oil as the old gm engines are not happy with modern high detergent synthetic oils as they apparently clean the engine to well so you can get oil wash by if the bores are starting to wear. When you say high vacuum I assume you are refering to overrun or using engine braking.
When you did the cylinder head work did you check the valve guides were ok as if worn they will cause smoking when applying the throttle after a period of overrun. My Father in law was a dealership mechanic in the 70's and the factory would not admit a problem and authorise warranty investigation work unless oil consumption was under 250 miles a pint.

Regards Andy
Mon 19 Dec 2016 @ 11:40 Edit this messageQuote this messagePMQuote this message
Anon
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Oil consumption

Hi daobra,

My own old Bedford CF 1980 uses one pint of engine oil over 250 miles and that from my Bedford days is very good for an engine with over 100,000 miles under its belt.
I do always use 20-50 oil with a good engine additive every oil change, which is once a year having done less than 3,000 miles in that year.
But these one slant engine's did always have a number of oil leak area's so make sure your not losing instead of using.

doujoy

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Mon 19 Dec 2016 @ 12:20 Edit this messageQuote this messagePMQuote this message
Anon
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Yes I do use 20W50 already and I'm indeed aware of synthetic oils cleaning out the deposits in engine areas. So just mineral oil for this engine. With this amount of oil refilling I find oil changes unnecessary really.

The valve guides were checked and found to be still pretty good so valves and seats were cut. When I took the head off I had to clean out a decent carbon collection on the pistons as well as the head. It was greasy even.

I have done an interesting modification on the head where I have cut three grooves per cylinder in the squish area, pointing towards the sparkplug hole. I have pictures if your interested. It runs quieter, more torque in low to mid
rev area and can idle really low like 400 rpm without shaking. Look up the Singh groove for more info.


I'm amazed with what you gents are saying about oil consumption on these engines. Apparently it is not even that crazy I hear you say. I still find it very high and should not happen, right? A little oil usage, sure, it is an old engine but our engines will faul quickly, I quess I just don't like excessive oil consumption.
Mon 19 Dec 2016 @ 15:16 Edit this messageQuote this messagePMQuote this message
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