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Location:
Hobart, Tas
Registered:
May 2002
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 Want to turn over an engine that's been sitting for a few months...[1GGTE]
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Sat, 18 September 2004 00:45
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I want to do a compression test on the 1G I bought. I know how to do a compression test, but if the engine has been sitting for some time(and is drained of fluids), is there anything I should do to avoid buggering it? How much oil does a 1G take, and how much do I need just to have enough to do a comp test? I'm going to pull the sump off after the comp test, so any more than nessesary will be a waste.
I was thinking pre-oiling the rings by squirting some oil in each cyclinder first would be a good idea, but that of course will affect the comp test 
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Location:
Ipswich
Registered:
October 2003
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Re: Want to turn over an engine that's been sitting for a few months...[1GGTE]
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Sat, 18 September 2004 00:58
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If you have an aircompressor you could try doing a leak down test, i think these are more informative, as it can tell you whereabouts you're losing compression. I think you can make a basic one out on old spark plug and some fittings. The guide was on the net somewhere.
Basically you just pump air into the cylinder whilst the valves are shut, and listen for escaping air, exhaust is exhaust valves, intake is intake valves, oil cap is rings, and water outlet is head gasket. Thats from memory. Someone may want to correct me.
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I supported Toymods
Location:
Perth, Western Australia
Registered:
December 2002
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Re: Want to turn over an engine that's been sitting for a few months...[1GGTE]
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Sat, 18 September 2004 02:22
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Most modern engines will sit quite happily for a few months, without affecting the springs or valve seats, though it does depend on how they've sat - obviously dry and sealed being the best. A compression test is much easier to perform than leakdoiwn test, and simpler for the novice to interpret. you'll need oil in the sump for the pump to pick up, I usually put about 2L in for a compression test. I'm not in favour of oiling the rings until you've at least done the test dry first, and then only to check the condition of the rings, and I always like to do my test cold and then warm to measuare any differences, when at operating temperatures.
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Location:
Hobart, Tas
Registered:
May 2002
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Re: Want to turn over an engine that's been sitting for a few months...[1GGTE]
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Sat, 18 September 2004 07:21
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Don't have a compressor, Matt_84, but thanks anyway. Seems intuitive.
Thanks CLG for the in-depth reply. No chance of doing a warm' test, this engine is sitting on my garage floor. Was just going to bolt up the bellhousing/startermotor and tickle the starter with a spare battery to turn the engine.
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Location:
Brisbane
Registered:
February 2003
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Re: Want to turn over an engine that's been sitting for a few months...[1GGTE]
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Sat, 18 September 2004 10:47
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if you are worried about no lube on the bearings, try this:
drain engine oil out of case and replace filter
sit engine on a tyre or two
fill crankcase with diesel fuel (as much as you can fit)
rock engine from side to side to get the fuel onto every internal surface
remove spark plugs
crank engine a few times via starter motor
dump that fuel (will help you start many bbq's or the odd bonfire)
replace the filter
install engine ... and off you go as per normal startup (within a few hours)
a very agricultural but effective way of lubing just about every internat wear surface.
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