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Date:         Sun, 6 May 2007 09:24:10 -0400
Reply-To:     Jonathan Farrugia <jfarrugi@UMICH.EDU>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Jonathan Farrugia <jfarrugi@UMICH.EDU>
Subject:      Re: oil pressure
Comments: To: Thomas Pfrommer <pfrommer@PHAS.UBC.CA>
In-Reply-To:  <463D9683.5060505@phas.ubc.ca>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed

Thomas

time to start reading up on vw engines :). the wasserboxer is in most basic terms just a water cooled version of the air cooled vw engine. that is a simplification but much of the basic stuff is the same between engines. also i forgot in the original post but you should have rebuilt the rods. did you do that? reading materials:

http://www.bostonengine.com/articles/low-oil-pressure.htm

http://www.bostonengine.com/articles/csccs.html

http://www-personal.umich.edu/~jfarrugi/mive_images/gene_berg_case.html

http://www.vwtrendsweb.com/tech/0204vwt_project_budget_beater_part_iv/

jonathan

On Sun, 6 May 2007, Thomas Pfrommer wrote:

> Hi Jonathan, > thanks for your reply .. line bore? I apologize for my ignorance, but > could you please explain to me what you mean? > Thanks > Thomas > > Jonathan Farrugia wrote: >> if you didn't line bore the case that is most likely your problem >> thinks me. >> >> jonathan >> >> On Sat, 5 May 2007, Thomas Pfrommer wrote: >> >>> Dear VW community, >>> I know this is a well-discussed problem and I read lots of threads and >>> goolged even more, still I would like to get a few more insights as I >>> don't know where the problem might be. >>> I am talking about my 1987 Vanagon, 2.1l waterboxer, Digifant, automatic >>> transmission. >>> I had a bad oil tube to the third main bearing, and ignored a bit too >>> long (10km on and off ) the oil warning light/buzzer. OK that blew one >>> the bearing. I took the engine out, completely took it apart at took the >>> parts to the machine shop so that they could machine the crank, the >>> heads, the cylinders, the cam and cleaned all junk out of the case. I >>> got a new gasket set, new oil pump, certainly new bearings, new drive >>> shafts/gears (distributor and cam). OK during spare times in the winter >>> a good friend and me built it together. Great! We brought it back into >>> the car, fired it up and it ran right away!! >>> Now first we experienced low oil pressure if the engine warmed up. It >>> was to overcome by slightly tipping on the accelerator but OK thats not >>> good. So i changed the relief valve spring which I should have done in >>> first place, changed the 0.9bar switch and also changed to 20W50 as I >>> first had 10W30 synthec. Certainly I also changed the oil filter right >>> away (Mahle, black). >>> After restarting, the temperature display would not move. After >>> rebleeding and no change, i changed the sender, and it worked. OK it did >>> work in first place when i first experienced the bad oil pressure and >>> now just bad lick I guess. Well anyway this problem is fixed. But after >>> warming it up I again get the pow oil pressure buzzer. No blinking >>> though while idleing or slightly lower rpm, do the 0.3bar sender does >>> not indicate, but the 0.9bar kicks in after warming it up and going >>> above 2600!! Hm Why 2600 and not 2000? Do I have the right oil pressure >>> at 2000 and then it drops? Hm very weired. OK I unplugged the 0.9bar >>> sender at the cable where it connects to the wiring from the harness and >>> watched when the buzzer comes on now just to see if the electronics >>> work. OK same thing again 2600 it comes on. >>> OK something in the electronics does not work exactly as it is supposed >>> to do, but anyway the low oil pressure is for real >>> , I guess. What the hack is going on? A problem with the new oil pump? a >>> missing gasket? Not that I know, we added the flat gasket between case >>> and pump, and the other flat gasket with additional holes between cover >>> (not new though .. will change when I have to open it again) and pump. >>> Now after inspection, I do not see any material between case and pump >>> ... was there a groove for this gasket? i don't know any more. But I do >>> see the flat gasket between cover and pump. Hm now after thinking a bot >>> more, is this gasket OK to have here? I know some explosion drawings >>> show it, some not. Should the gears touch the cover to not let oil >>> bypass them? With this gasket of ~1mm certainly oil can bypass the >>> gears. >>> Or, did the shop recommended the wrong set of main bearings -- they >>> said, the original sized ones will fit, and i just do not have enough >>> back pressure to maintain 2/3 bar above 2000rpms? (Please not as I do >>> not really feel to open everything until the last screw again) >>> I know that without any real oil pressure gauge nobody can help right >>> now, so i will install a mechanical gauge and see what the real pressure >>> says. however, as the 0.9bar sender is new (Hey what a pain to install >>> with the engine in the car), I am quite confident, that the problem is >>> insight (unfortunately). >>> If the main bearings are a little bit too large, would the heavy duty >>> oil pump overcome this problem? I guess it depends on how far off i am >>> with my pressure, well just below 0.9bar I guess, as a small tip on the >>> accelerator shuts the buzzer off. But it should have anyways between 2 >>> and 3 bar, and not somewhere around 0.9 bar. >>> I would greatly appreciate if anyone could help me with this problem or >>> experienced the same error and found a solution. I do not see any oil >>> drop. However there is a little bit near the oil pump, but not a lot, >>> even after running it for 20/30 minutes (I did not longer terms, as I am >>> afraid to damage something .. even if the buzzer was not on) >>> Why does the switch to the 0.9bar sender comes at 2600 rpms and not at >>> 2000? The green wires are connected to the ignition coil. There are two >>> open yellow connectors near the electrical ignition system box, which >>> are not connected, and I think they were not when I took the engine off, >>> but I am not sure. Do i have to connect them? I could not find from the >>> Bentley for whet they are there. >>> I hope that was not too long. >>> Please let know what you think. I will keep you posted, what the oil >>> pressure gauge says, once I have found one and the right M11x1 adapter >>> to the 0.3bar thread. >>> Thanks >>> Thomas >>> >>> >>> > > >


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