No oilpresure when starting cold engine
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peanut
Active member
I suspect the oil pressure sender or the guage. It cannot be the oil is actually taking that long to get up to pressure or your top end would be clattering away like a bucket of nuts.! The other important thing is that if eventually the guage is showing full pressure 4-5 bars then you are unlikely to have a leak anywhere.
I would change the oil filter if you haven't aleady done so just in case it is blocked . Replace the sender .Check the tightness of the front crank nut then I would find a point where you can plumb in a mechanical oil pressure guage to do a check on the actual oil pressure and time to reach 5 bars
I would change the oil filter if you haven't aleady done so just in case it is blocked . Replace the sender .Check the tightness of the front crank nut then I would find a point where you can plumb in a mechanical oil pressure guage to do a check on the actual oil pressure and time to reach 5 bars
Hilux
New member
After a week or so without starting mine rattles the tappets for 3 - 5 secs then the gauge shoots straight to slightly under 5 bar and the tappets fill and the noise stops. When used regularly it doesnt.
Someone (possibly Bert Gear) said on a forum somewhere that there is a drain down one way plug that might be stuck???
It was Jon Mitchell see here
Someone (possibly Bert Gear) said on a forum somewhere that there is a drain down one way plug that might be stuck???
It was Jon Mitchell see here
peanut
Active member
ahhhhhh really ..... right well in that case the oil is obviously actually taking a long time to reach the top end and it isn't due to a faulty guage or sender .
I would start by tracing the oil flow to the top end on a schematic to see if you can spot any potential blockage points. You may well have a partial blockage caused by some contaminant like silicon or hermatite . Silicon is a curse to engines and frequently gets used when a gasket isn't to hand.When applied and the part is tightened down It squuezes out into the oil and waterways and then travels round until it gets wedged somewhere narrow, restricting the flow. Have you had any new parts fitted in the past 6 months or so ?
Another likely source is a leaky gasket or seal somewhere which is letting by but then you would expect your pressure to be well down say 3 bars cold. If it reaches 5 bars then its probably a partial blockage problem .
Another possibly is a faulty oil pump but that would tend to happen slowly over months not all of a sudden unless your crank damper bolt has loosened. Worth re-torquing that to eliminate that.
I would be tempted to drain the oil and flush the engine with a flushing oil. Remove the filter , sieve the oil and inspect and tear open the filter and check for any trace of contaminants. If none found then you have eliminated a potential problem source and an oil and filter change is cheap and good for your lump anyway
I would start by tracing the oil flow to the top end on a schematic to see if you can spot any potential blockage points. You may well have a partial blockage caused by some contaminant like silicon or hermatite . Silicon is a curse to engines and frequently gets used when a gasket isn't to hand.When applied and the part is tightened down It squuezes out into the oil and waterways and then travels round until it gets wedged somewhere narrow, restricting the flow. Have you had any new parts fitted in the past 6 months or so ?
Another likely source is a leaky gasket or seal somewhere which is letting by but then you would expect your pressure to be well down say 3 bars cold. If it reaches 5 bars then its probably a partial blockage problem .
Another possibly is a faulty oil pump but that would tend to happen slowly over months not all of a sudden unless your crank damper bolt has loosened. Worth re-torquing that to eliminate that.
I would be tempted to drain the oil and flush the engine with a flushing oil. Remove the filter , sieve the oil and inspect and tear open the filter and check for any trace of contaminants. If none found then you have eliminated a potential problem source and an oil and filter change is cheap and good for your lump anyway
You haven't had the belts changed recently have you? The reason I ask is because the crankshaft pulley nut needs to be really tight - to the quoted spec. The oil pump drive is only "clamped" in place by said nut, so if it isn't tight it can slip. Two effects could cause the delay as a result of this - the first is that as it warms up, it expands, and tightens up, the second (and possibly more likely) is that the interaction of the two surfaces will eventually cause the pump to catch up with the crankshaft, in much the same way as a speedo works (well, actually nothing like it...).
An easy one to check and fix anyway.
Sorry Peanut - just noticed you have already mentioned that... teach me to read things properly won't it[
]
An easy one to check and fix anyway.
Sorry Peanut - just noticed you have already mentioned that... teach me to read things properly won't it[
]
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