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 Post subject: No oil pressure when hot
PostPosted: Thu Feb 19, 2015 6:42 pm 
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Joined: Thu Feb 19, 2015 4:16 pm
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Location: Phoenix, Az
I had the head done at machine shop and put new rings in but left bottom alone on my 92 Geo XFI 1.0 engine.
It runs fine when cold but once warmed up the oil pressure goes all the way down. i even put a gauge on it to verify. I was given new lifters with the purchase and new stainless valves..
The new lifters had dbl the space in the middle for the oil to enter.
so after having the engine start to knock from the low oil pressure my mechanic ( good buddy) and i put the old lifters back in to see how that worked but still same problem. We are perplexed!

any ideas? Yes while apart I made sure the oil valve was working as it slid in and out real easy and i blew air thoughout block.

Mike


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PostPosted: Thu Feb 19, 2015 8:25 pm 
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Where are you measuring the pressure from? Next to the oil filter or from the head?

My own experience on a GT when I measured it at the head the pressure was always very low at idle.

Do you get *any* pressure at all when it's warm by raising the idle at all?

What space on the lifters are you referring to that has double the space?

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PostPosted: Fri Feb 20, 2015 3:05 am 
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Yes right where the original oil pressure wire hooks up nex to oil filter

The circle around the lifters that look like they could fit an o-ring.
The new lifters i had in and took out had a dble amount of space than the old ones. this would be like the rings around the pistons

so the pressure is high when first running but as it gets warm she fals and i have to rev her about 3k to get it to come up just a little and if i wait to long i have to shuit her down because of the noise that my boss buddy says sounds like lifter moise clacking

she gets loud enough im afraid to freeze her up


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PostPosted: Fri Feb 20, 2015 4:22 pm 
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Okay that sounds really strange then.

The lifters (new ones) are too small for the bore then sit in.. That would certainly cause an oil pressure drop, but having switched back to the old ones, the low oil pressure persists...

Well, I would have to say that the oil pressure relief spring in the oil pump has gone bad, or the oil isn't draining back to the pan fast enough.

You just did the head on it, did you by chance do something wrong with the headgasket? It is possible to put them on upside down, but I am not sure if that would cause this particular oil pressure problem.

When the oil pressure drops to near 0, shut 'er off, and quickly check the oil level on your dipstick. If it is really low, then I would say you have a oil drain back issue probably from a head gasket issue. Other wise, I would say you have an oil pressure relief valve problem, which your probably not going to enjoy fixing.

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PostPosted: Tue Mar 03, 2015 8:11 am 
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Location: Texas 75150
Did you put the oil restricter back into the block at the head?
I just got a GT short block and the crankshaft did not have
the plugs installed in the ends of the crankshaft oil galleys.
I had to install new plugs and peen them over in this crankshaft.
I had a non GT 1.3L with low oil pressure and solved it by changing out the
old hard cracked o ring on the pickup tube.

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PostPosted: Tue Mar 03, 2015 1:51 pm 
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Location: Phoenix, Az
yes its in there. i took it out to see what it was and wiped er off an for sure she is back in there.
we are still baffled. we only get a chance to work on it once a wek maybe. I took the head back off to examin the head gasket and all looks good.


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PostPosted: Sat Mar 07, 2015 12:35 pm 
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No, you didn't leave the bottom end alone. You had to remove all the bearings in order to get the crankshaft out, and you also had to dink around with the oil pickup tube, oil pump, etc.

Assuming the rod and crank bearings were okay before tearing into it, I suspect that something--oil pump, pickup tube, bearings, didn't get put back in right. For all I know, the oil pump was never bolted tight to the block.


The reason oil pressure goes down as it warms up is probably since the oil gets thinner as the engine gets warmer.


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PostPosted: Sat Mar 07, 2015 1:13 pm 
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phantomrt wrote:
No, you didn't leave the bottom end alone. You had to remove all the bearings in order to get the crankshaft out,



Did I miss something? Where did he say he removed the crankshaft?

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PostPosted: Sat Mar 07, 2015 6:44 pm 
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Never took crank out. I only did remove the rod bearings to do the rings.

My buddy mechanic were discusiing if while we were conversing if maybe we turned a bearing the wrong direction.

does anyone know what that would do??
I was guessing eat it up fast?? Howvere we havent run the engine for more than 4 to 5 fifteen minute warm ups.

we are still baffled and she sits in my driveway until we can figure something out aside from throwing money at it by getting new lifters again and maybe a new oil pump but none of these makes sense so far.


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PostPosted: Sat Mar 07, 2015 8:19 pm 
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The only guess I would have at this point is the oil pickup is clogged or fallen off, or there is something wrong with the oil (wrong grade).

I would drop the pan and have a look. The bearings for the con rods do have a hole in them for squirting oil out when at TDC, but if you had the bearing the wrong way you'd probably have higher oil pressure.

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PostPosted: Sat Mar 07, 2015 9:09 pm 
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Plus 1 ^^^^^^

I subscribe to this thread

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