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UPDATE to the dead gas gauge 200

posted by trichard on Wed Oct 15 11:34 CST 2008
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last visit: Fri Oct 24 05:52 CST 2014

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today i got into the trunk and checked the sender for continuity which came right within specs for half tank.

i checked for continuity to the gas gauge with a 68 ohm resistor and got bupkus.

after removing the cluster i find the po has removed idiot light number 13...oil pressure light......HMMMMMMMM

no time now to check that swapped clusters with a know good one with almost same mileage and then went about to repair the front end oil leak which turns out to be an original obsidian like crank seal and failing intermediate seal. after pulling and replacing the 2 smaller seals my seal puller shattered the crank seal ...hard as glass.

all seals done change oil and filter put it all back together and start it up.

now the oil pressure comes and STAYS on under 1000rpm at idle only using 10/30 oil.

any suggestions for my next moves?

compression check was good before i bought the car.

mileage 138k 1993 940 regina

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final update and resolution to oil light 200

posted by trichard on Thu Oct 16 01:13 CST 2008
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last visit: Fri Oct 24 05:52 CST 2014

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thanks to all who offered help

who would have thought unbolting the oil pressure light wire as itr passes under the seal carrier and then re fastening it would be enough to cause the connector onto the sender itself to interrupt the quality of the connection but it did.

i remove the connector and checked for continuity and all checked out

i checked the sender itself at rest and found 1.3 ohms and then with engine on infinite resistance which is what it is supposed to be

redid the compression and found 165 x 4 not exactly readings from an oil starved engine

next step was to check the oil pressure but first had to buy milk so i re connected everything and lo and behold the oil pressure light comes on at ignition and goes off upon startup.

not having done anything material i have to surmise my moving the wire around yesterday must have caused the connection to degrade

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UPDATE to the dead gas gauge 200

posted by Jorrell on Wed Oct 15 12:43 CST 2008
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last visit: Thu Dec 27 03:00 CST 2012

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Replace the oil pressure switch that is located near the oil filter on the pass side of the engine. I worked on one car that had perfect oil pressure, but someone had installed the wrong switch (because the old one was leaking and the new one "fit").

Of course, the only way to be sure is to hook up an oil pressure gauge in place of the switch as a test.

jorrell
--
92 245 250K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!

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checking pressure 200

posted by trichard on Wed Oct 15 13:07 CST 2008
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last visit: Fri Oct 24 05:52 CST 2014

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i thought i would check oil pressure using the 6mm hex screw just under the water pump on the left side. i do not have test gauge but i do have an oil pressure gauge meant to be added to someones instrument cluster.

do you think that would work well enough for test purposes?

do you happen you know what range of pressure in psi i should expect at idle and at higher rpm?

i do not have fresh oil pressure sender but can fetch one from the boneyard down the road for test purposes.... i think it is the same sender for all 240's 740's and 940's...yes?

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checking pressure 200

posted by Jorrell on Wed Oct 15 13:28 CST 2008
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last visit: Thu Dec 27 03:00 CST 2012

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Sorry, my manuals are packed away right now and I can't recall the pressure vs. RPM curve, although it is typically spec'd as minimum at idle and a maximum pressure that is controlled by the relief valve in the pump. Hopefully, someone else has their "bentley brick bible" near by and can give you the number.

I have only used the oil pressure switch hole to hook the gauge to, so from personal experience, I can not comment on the 6mm bolt you mention.

Once you do have a gauge hooked up, if the pressure is low, don't panic quite yet, especially if the PO didn't keep up with oil changes. A friend of mine in Ohio has resolved a couple low oil pressure engines by dropping the oil pan (PITA) and cleaning the 99% clogged pickup screen on the end of the oil pump pickup tube.

Please note that I'm assuming that you aren't hearing a bunch of clanking from the engine while at idle or otherwise. If there is a bunch of clanking, it's time for a different conversation!

jorrell
--
92 245 250K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!

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checking pressure 200

posted by trichard on Wed Oct 15 13:42 CST 2008
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no clanking. the engine actually sounds sweet except for an exhaust to header gasket which is mildly making noise and is due for change in the next day or to.

otherwise the engine sounds strong and right at all rpms

i called the po who is an elderly man who bought this from a dealer in new london ct in 2002 when it had 108k since then he has put on 30k and told me a half hour ago he NEVER saw the light come on. i believe him.

ergo the po of the po or someone else pre 2002 pulled bulb 13 on the cluster.

i should think the dealer would have noticed but maybe not.

i can only assume the engine would have blownup a long time ago if the pressure was really that bad. i will nevertheless get the bottom of it tommorrow.

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checking pressure 200

posted by Jorrell on Wed Oct 15 14:07 CST 2008
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I concur with your analysis, if the PO says things were taken care of and the engine sounds like a singer sewing machine (valve and injector noise only), its time for a new oil pressure switch.

jorrell
--
92 245 250K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!

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checking pressure 200

posted by trichard on Wed Oct 15 14:46 CST 2008
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thanks jorrell i also think the switch is questionable.

the po is an elderly reverend dr. who always had the car serviced at chase volvo in new london or european auto in clinton ct.

he gave me all the repairs records since he owned the car.

i am not sure if i should remove the 3 religious bumper stickers off the back bumper and the jesus emblem on the rear of the trunk lid.

i am not much for religion of any variety but why take the chance if someone is watching over the car.

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checking pressure 200

posted by Aye Roll on Wed Oct 15 17:53 CST 2008
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Hi Trichard-

This one's kind of been on my mind and didn't get a chance to respond earlier. I *just* replaced a failed oil pressure switch on my bro-in-law's 93 945T yesterday. It was pouring out oil and was failing "ON", i.e. showing the light. Scaring me about the health of that sweet late model K engine...

Anyway replaced the sender and that was no big deal, just takes a deep 15/16
socket. The connector was toast- the plastic just crumbled away. The center
brass was good so I was able to reconnect it.

The issue I'm getting to is that the wire could easily be damaged on your car. It runs in a terrible place and could have been inadvertently grounded out when you did the crank seals. It runs right under the front timing cover. Often the harness sheathing is hard as your crank seal was.

The only way to know for sure is to do an oil pressure test, but a new switch is not an expensive part, and should function as new. Spec I think is to maintain 10-psi at idle, which on a very hot day can sometimes result in oil light flicker when you come off the highway. Running 15W40 oil in all but the coldest times of year will prevent the light from coming on in general.

We oughta get together one of these days...

--Rob Bareiss, New London, CT

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checking pressure 200

posted by trichard on Wed Oct 15 22:12 CST 2008
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hi rob

i would like that.

i have not been back to new london in many many years. as a kid i spent most of my summers at ocean beach amusement park and niantic where we had a shack near the beach. heck i go back WELL BEFORE they built the nuclear power plant which you can see from niantic and my first bicycle memories are of the draw bridge which which more rotated then went up and down allowing big boats access to the bay into niantic.

boy that that takes me back. clamming in the bay, blue fishing out at the race near the eastern tip of long island, being a teenager and going to block island for some drinking and debauchery.........it all seems 100 years ago.

PS rob

i toyed with idea but did not of removing the seal carrier before i changed out the seals and went so far as to remove all bolts including the 2 nut over nut which hold that wire under carrier from the pressure switch. the casing looked good then. do you think the light would go out above 1000rpm and stay on below IF i have a short or electrical problem? would it not tend to remain on all time?

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checking pressure 200

posted by Jorrell on Wed Oct 15 16:04 CST 2008
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last visit: Thu Dec 27 03:00 CST 2012

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Ted,

Wow, I'm not sure I can give you an answer about the bumper stickers. All I can give you is an opinion. On January 12th 2002, my wife crashed our 89 244 at 55MPH into a creek bank due to a cut tire, the car was shortened by four feet. She survived despite having a broken neck and having her heart restarted twice at the hospital. After six months, she fully recovered with no ill effects. Even her neurosurgeon was telling me right after the accident that she would be a quadriplegic or die from her injuries...less than a 2% probability of full recovery. Then I showed him the pictures of what was left of the 244, his comment was crude but compassionate... "now I understand why we didn't have to amputate her legs. Please note that her only leg injury was a dime sized bruise on her right knee!

Our 5 year old Boxer dog was in the crash as well, curled up in the passenger side front floor (where he always hung out), he walked away without physical injury, but after that, getting him in a car was a true nightmare!

So, can I give credit to Volvo's 240 design, yes, absolutely! Can I give Volvo all of the credit for their product saving my wife's life... absolutely not! The good Lord and the good Doctors stepped in and made her recovery possible!

Please note, the 89 244 had no bumper stickers at all, religious or otherwise. That being said, at the time we were considered to be "heathen Methodists" by our southern Baptist neighbors! In closing, I have to guess that heathen Methodists receive the Lord's mercy and support just like the rest of us do!

So when it comes to the bumper stickers on your 240, rip them off if you don't like them, just maintain your faith! Its all about the faith!

jorrell
ps. I know the above is over the top but don't give up on your beliefs, no matter how faint! Sorry, this one should have been on the opinions page.
--
92 245 250K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!

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