HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Oil pressure issue

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Oil pressure issue

Post  cfgioja on Sat Dec 25, 2010 5:04 pm

At the first week of idle the oil was at about 3 or 4 bars, which is roughly around 40 psi.

After letting it run for its usual 30 mins for a few times over a week, I decided it was time to drive it. Seemed to be fine. After 3 weeks into the startup I took it to town the other day and after 5 mins into the drive I realized my oil pressure is dropping down past 1 bar, about 14 psi or less. The chevy mech man here told me the engine only need 4 psi per thousand to run.

It has a brand new oil pump and brand new everything. I am running royal purple break in oil. I took the pressure sender off and tried to hook my manual gauge up but it only reads 25psi or above. So no go, I unhooked the oil sender and cranked the engine and the oil came out. So I have oil traveling my engine.

There is no over heating problems, oil level is good and there are no leaks or unexplained smoking like a bad seal some where, also checked the gauge and have full sweep when grounded. I am not sure what to do next. Please help.
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Re: Oil pressure issue

Post  Porch on Sat Dec 25, 2010 5:23 pm

You might check to see that you didn't install the lines backwards to the oil filter. I did that once Smile
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Re: Oil pressure issue

Post  cfgioja on Sat Dec 25, 2010 6:23 pm

If that was the case would it not have had pressure at all to begin with? I will double check everything on the bottom too just to be safe.
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Re: Oil pressure issue

Post  Admin on Sat Dec 25, 2010 6:32 pm

Get rid of the royal blue "break in oil" , Brake in oil is not meant to be driven much. Also I would not break in a motor on a synthetic oil.

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Re: Oil pressure issue

Post  cfgioja on Sat Dec 25, 2010 6:59 pm

I also wondered about that. The oil gets really thin when at temp
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Re: Oil pressure issue

Post  cfgioja on Sat Dec 25, 2010 9:08 pm

Unhooked both lines and had my wife turn the ignition over, oil comes out of both lines. This sounds like the pump or the gasket to the pan is messed up. I will have to pull it apart to find out.
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Re: Oil pressure issue

Post  Porch on Sat Dec 25, 2010 9:56 pm

Hmm, that's pretty weird.
I have a RH pan and i had to drill/tap a hole between the two lines and put in a bolt to really hold the pan down in that area.
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Re: Oil pressure issue

Post  cfgioja on Sat Dec 25, 2010 11:10 pm

I'm in the process of dropping the cross-member to pull the pan to see if the o-ring is pinched or something. Other than that the LS1 guys are saying the pressure regulator valve in the pump could be stuck. Not sure. I just bought this one new from Chevy, and have two old ones that I can run to see if that helps.

I will double check the gasket seal between the in and out ports on the pan once I get it off. I am hoping the pump is bad since it worked and now it doesn't, it would make sense that the valve would be stuck then. But nothing else right now is clicking in my head.

Regarding dropping the cross-member, has anyone designed a brace to hold the engine up without the cross-member in place. I have seen them on some cars for working on the lower end with a setup like ours. I would be able to work under there without my cherry picker in the way.

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Re: Oil pressure issue

Post  Admin on Sun Dec 26, 2010 8:39 am

Lay piece of pipe across the strut towers and just loop some small chains down around the second tube on the headers. It'll hang fine.

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Re: Oil pressure issue

Post  Porch on Sun Dec 26, 2010 9:36 am

Harbor freight also sells a bar. I don't think it's much better than a piece of pipe though...
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Re: Oil pressure issue

Post  Admin on Sun Dec 26, 2010 1:44 pm

I have been using a piece of pipe for years. I just drilled a couple of holes in it and use 2 "J" bolts. I hook small pieces of chain on to those to hold the motor and they give me some adjust ability.

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Re: Oil pressure issue

Post  xschop on Sun Dec 26, 2010 8:59 pm

Here's what could be your problem. Especially on a new re-build....

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Re: Oil pressure issue

Post  cfgioja on Sun Dec 26, 2010 9:40 pm

I have no idea. I will have to look at that. It sucks if I have to pull this thing completely out again. I did find my pickup tube debris screen was clogged with what seems to be chunks of gasket maker, but that doesnt explain the back feeding. The plug that your thread list might be an issue. I will let you know.
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Re: Oil pressure issue

Post  Admin on Mon Dec 27, 2010 7:28 am

Where did the gasket maker glob come from? there is no reason to use sealer on nearly any part of these motors. 90% of the gaskets are "O: ring based gaskets. Shocked

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Re: Oil pressure issue

Post  xschop on Mon Dec 27, 2010 7:36 am

In the tutorial they also mention a stronger oil pump spring for bigger cam, higher Oil pressure....
but here's what I'm talking about can be overlooked on the back of the block under the cover....

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Re: Oil pressure issue

Post  cfgioja on Mon Dec 27, 2010 1:00 pm

Eric, I may have messed up when installing all my parts. I saw that the oil pump went against the block and connected to a galley there, but I had no gasket, I used a small amount of gasket maker there to make sure it had a good connection to the galley. I mostly likely did something wrong, I saw everything else had a gasket of some kind and figured it needed it too.

Well I am pulling everything apart to make sure its ok. I did drive it some with the pressure issue after the GM mech here told me it should be ok. I did not have any bad noises or overheating, or unexplained white smoke so I am hoping the engine is still good.
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Re: Oil pressure issue

Post  cfgioja on Tue Dec 28, 2010 8:36 pm

I have the engine out and back on the stand. I pulled apart the valve covers, oil pan, and rear block seal. So far nothing out of the ordinary, except some gunk inside the oil passage when I took the Allen bolt out by the in and out ports on the bottom of the block. I dont think I had this block dipped when I got it since it was already rebuilt and assembled. That is probably my problem.

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Still need to pull the crank pulley and front cover off to check the oil pump completely. But everything on the engine is still looking good.
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Re: Oil pressure issue

Post  cfgioja on Wed Dec 29, 2010 7:58 pm

Great news, I broke my crank pulley tab trying to get it off earlier. I dont have any type of heat source to loosen the thing up with, so I am going to have to take it back to the machine shop that did the balancing and have them finish the rest of the tear down and dip the block then. I am hoping by February to be back up and running.
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Re: Oil pressure issue

Post  laptop_geek on Wed Dec 29, 2010 11:44 pm

Aww man, that sucks. After you had this all in and ready to go. Well at least its during the winter when you wont drive it much anyway. Hope all goes well at the machine shop.
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Re: Oil pressure issue

Post  cfgioja on Tue Jan 04, 2011 1:17 am

well found a big enough 3 jaw puller to pull the pulley off at home and tore the engine down the the bottom end for the night.

I made a couple of discoveries I will add up to a first time mistake. The first thing I noticed is when I removed the rockers arms, the 7th cylinder intake rocker had came unload and allowed the pushrod to bounce around and chew the rocker up alittle. I dont think it is to devastating but will be calling comp cams to find out for sure. That cylinder did not look like it had been fired once.

The second thing I found out is that I dont believe it was the gasket maker I put on the oil pump that was the cause of the pressure issue. I know now it is not right but the gasket seal was still in one piece and no tears. I did however find in the valley area that there is a layer of silver paint coming off the interior of the engine. That would explain the floating particles that clogged my pickup tube and oil pump.

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I am finishing the tear down and going to take the block to get dipped. I will also have them check the bearings to ensure they are still good.
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Re: Oil pressure issue

Post  Admin on Tue Jan 04, 2011 8:25 am

Who painted the inside of the block?

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Re: Oil pressure issue

Post  cfgioja on Tue Jan 04, 2011 9:12 am

The previous owner did or where he got it from.
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Re: Oil pressure issue

Post  stuart f. wright on Fri Jan 07, 2011 3:18 am

sometimes it takes alot of tries to get it right.sorry for your bad luck .i myself went through a simular situation except my motor had sat for a couple of years .and when i installed it and got it running i had an oil presure issue you would never believe the culprit could be some wasp nests that were constructed while the motor sat.trashed a 600 dollar crankshaft.one thing about it you will be able to put the car to gether blinfolded i bet.this your second one youve built so far if i remember right.its looking good though my compliments keep up the good work friend
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Re: Oil pressure issue

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