O No!!!!

[SMOKEYDUB]

what should the oil pressure be at warm idle on a 1.6 td ( stock oil pump)?
My mechanical oil pressure guage reads 10 psi :cry:  Is this normal? :x

Thanks

Jeff

[andy2]

both of the 1.6td's that I,ve checked oil pressure on were at 9-10 psi at idle when hot so I guess its normal

[jtanguay]

if that was a cold idle pressure then I think it would be okay, but when oil heats up it expands and is free flowing...  I'm no expert as to the pressure on a diesel since I have not installed my PSI gauge yet, but I believe that 10 psi is a bit low for a warm engine.  Either add oil, or try adding one of those engine cleaners that clean out your oil system.  

How does the oil pump system on the 1.6L TD work? is it belt driven?  Could the belt be worn and not turn the pump enough??? any thoughts?  

jon

[jtanguay]

ah thanks andy.  like i said im no expert

jon

[Rat407]

For what it is worth, I just rebuilt my 1.6 with all new bearings, rods, mains, interidiate shaft, new oil pump and I get 8 psi warm at idle and 20psi warm at 2k rpm.  It has been running great and I put 4k miles on it since I installed it with the oil pressure that way. The only bad thing is that annoying oil flashing/buzzer going off all the time.

[fspGTD]

Do all of you have hydraulic lifters?

I get 1.8 bar (26.5 psi) of oil pressure at a hot idle, as measured on the cylinder head tap, for a solid lifter 1.6lTD motor.

[fspGTD]

How does the oil pump system on the 1.6L TD work? is it belt driven?  Could the belt be worn and not turn the pump enough??? any thoughts?  

jon

It's driven off the back side of the timing belt to the intermediate shaft pulley...  this is a smooth pulley (not cogged) so I suppose it could slip if the timing belt were loose, or if it were oiled, but I don't know!  It's gear-connected from the intermediate shaft to oil pump so there is no way it could slip there.

There are several places where faulty pressure relief valves could cause low oil pressure in a 1.6lTD...  in the oil pump is the main oil pressure regulation valve.  Then in each of the 4 under-piston oil squirters there is a valve that isn't supposed to squirt any oil under the pistons until oil pressure is adequately high.  If any one of those valves were stuck open, I'd imagine it would drop oil pressure most noticeably at hot idle.

But it sounds like there might be some precedent to hydraulic lifter motors running low on hot idle oil pressure measured at the head from what these others are saying.

[QuickTD]

My 1.9TD runs about 17-20psi at a hot idle 35-40psi@2000rpm, hydraulic lifters of course. Sloppy intermediate shaft bearings will drop the hot pressure quite noticably. I changed mine at 200000km when I noticed a lot of radial play in the shaft during a timing belt change. Gained about 5psi across the board. This doesn't explain Rat407's lowish oil pressure though, his I-shaft bearings are new.

[Rat407]

Yep hydraulic head here. Now for those valves down by the squirters, can they be replaced with the engine still in the car?

I get 0 yep ZERO oil pressure at the head sender port, as shown by my new mechanical gage that is verified working correctly. That is of course at warm operation. On the coldest morning around 23 F -5C the oil pressure on start up hit a wopping 23psi and that is running straight 30weight Shell Rotella. It doesn't take but two miles of driving down the road for it to bottom out to zero and stays there no matter what RPM.  If I knew it wouldn't hurt the engine and turbo, I was considering running 60w racing oil just to see what would the pressure would be, but of course that isn't going to happen, I just rebuilt this thing and don't need any other problems.  

The head is the only thing that I didn't mess with as far as rebuild. I just had it surfaced and checked, no valve work or seal replacement.  Yes I messed up and will never do that again.  Once my garage is built, which hopefully will be by the end of Dec, I'm going to take the head off and have it gone through 100%, as well as the turbo just to take them completely out of the loop. I need this thing to last a long time and what extra cash I put into it now is well worth it since I don't have a car payment.  With 460lbs of compression on all 4 cylinders the 1 qt of oil use at every 400 miles has got me stumped. So when the head is off the pistons will come out to make sure the rings are good.

Question on pulling the pistons. If they are seated now and I pull them out will they be seated when I put them back in, or will they have to seat all over again?  Just curious.

[QuickTD]

Question on pulling the pistons. If they are seated now and I pull them out will they be seated when I put them back in, or will they have to seat all over again? Just curious.

I've tried removing/reinstalling piston rings many times, mostly on motorcycles and small engines. Never had much success. The engines always smoked and consumed oil afterwards. The rings wear to fit the bore and it's impossible to get them back in the same position during reassembly. You might be able to hone the cylinders to break the glaze and get the used rings to seat again. If you could get new ones cheap I'd just hone the bores and replace the rings.

[andy2]

both of the engines that I checked were hydraulic and I used the port on the cyl head for checking the oil pressure, also both engines are in half decient running order but are far from new. I thought I heard somewhere that the older oil pumps had some issues and were updated to fix a low oil pressure condition on an otherwise good engine but mabye that's not true :?:

There must be a significant difference in oil pressure when comparing engines with hyd and solid lifter heads  

while on the topic of oil pressure at what pressure does the low oil pressure light come on at :?:

[SMOKEYDUB]

I have hydraulic lifters and I am running my oil line from were the old oil sending unit used to be. It's right were the line for the turbo feed comes out just behind that. It is a mechanical guage not a electric one. (DAM THOSE ELECTRIC GUAGES!) Sometimes I can really here my lifters clicking alot so maybe soon i will get a hv hp oil pump and a 1.9 td head. HEHEHE :twisted:

[janb]

oil Pressure on TD's w/ hyd seems dreadfully low at head.  My two brand new 1.9's (hyd), only muster 45psi cold, and 20psi @3000 hot (15w-40 dino)  My 1.6TD Hyd only ran 20 hot, so I pulled it out  :oops:   the Hyd supposedly have higher volume, less pressure.  I intend to put a sensor at filter housing, and a switch on gauge so I can check each source.

My Mech engines frequently bury an 80PSI gauge (at head)

Most usual cause of low pressure is bad intermediate or main bearings.

[VWRacer]

while on the topic of oil pressure at what pressure does the low oil pressure light come on at :?:

The Bentley for my '84 Quantum TD calls for the low oil pressure light to come on at 6.5 psi, but I think the '84 is a solid-lifter head.  :?