355 Oil delivery issue

The oil tank slowly drains to the crankcase ..

Why do you think it is not just low on oil va something else

Did you drain the crankcase ?

Sorry but I just making assumptions since I nee more info

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When cold a correctly filled 355 may only have a quart or two in the tank. Not a bit surprised at your experience.

There are proper ways to determine the real oil pressure. I'd suggest you have someone do it.

 

You have to run the motor and get it up to temp and check the oil tank stick then. Its dry sump so when sitting for a period the tank can be basically empty. You cant take oil level reading from the tank when cold and especially after sitting. Pressure sending unit perhaps, that's the most likely or easiest to check I suspect.

 

Did it wrong if I am not mistaken. Tank is pretty dry when cold. All oil is in sump. Have to start, then drain. But has to be at operating temp to do proper change.

Drain Sump, tank and oil filter.

The tank is for circulation, pressurization and expansion. Not storing.


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Doesn't sound good. When did you last check the oil level? Was there any contamination in the filter?

Here is the oil flow path:
Oil from the tank is gravity fed to the "pressure pump" (there is a pressure adjusting valve associated with this pump).
The oil is pumped up to the filter and pressure sensor.
The filter provides oil to the engine for lubrication/cooling.
The hot oil drains into the sump.
A "scavenge pump" (with filters on the two inlets) in the sump picks up the oil and sends it to the oil radiator for cooling and back to the tank for the next cycle.

Would a blocked filter cause an increase in pressure (is the sensor upstream of the filter?). What fault would cause both low pressure and little oil in the tank? Would a scavenge pump failure stop oil returning to the tank and therefore give little oil to the pressure pump? Do oil radiators get blocked? I see there is also a filter in the bottom of the oil tank. Has anyone ever checked this?

It's recommended that you clean the filters on the scavenge pump inlets from time to time, but this involves removing the sump. I did this on my last major.

 

Like RifleDriver said, other ways to test and do so properly. Let someone qualified do that and not guess. Low oil pressure would cause other noises and issues. Check it with proper tools and knowledge


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Since you did not check for 2500 miles your pressure issue could be low oil level as it sounds like your motor is burning oil. If you top it up and have pressure again then monitor your oil consumption.

 

+1, the OP could easily be down two or three quarts in that amount of miles...especially if it was kept at the MIN or in-between the MIN and MAX marks. My 355 would consume as much as 1 quart in 900 to 1000 miles if driven spiritedly. For this reason, I kept it topped near the MAX mark. If I was just driving sedately or cruising, I could go 2000 to 2500 miles before adding a quart. Engine was fine, I had two major services and it passed compression and leakdown tests each time...sold it with 62k+ miles on it.

When I bought my car (used), and checked the oil during the first week, it did not measure on the stick. I reread the manual to ensure I was doing it right. (I was new to owning a dry sump engine) Added a quart, still nothing. Called the selling dealer, and they said to add another. Then it read near the bottom. I ended up adding about 4 to 4.5 quarts to get it near the MAX mark.

 

You should be checking that oil every single time you fill it up with fuel just on principle!

 

I never check mine. Over the period of a year between oil changes it never goes down enough to worry about so the only time the dipstick gets used is when I fill it.

 

Generally yes, unless you have a car you KNOW eats oil then you have to check regularly. The catch is, until you know if you have an oil eater you should check regularly. This can help others avoid the issue encountered by the OP. Once you establish you do not have an oil eater your good with much less frequent checks. I checked after every drive for first 1000 miles. The manual lists something absurd like burning a quart every 1K miles as normal without getting into why they did that. Why some don't burn any that is notable while others burn a notable amount is discussion for another thread.

Check until you know your car regularly when warm is basically good advice.

 

I don't know what the issue of the OP is.

1) Low oil pressure? How low? What did the guage say at warm idle?

2) Did the low oil pressure light come on?

3) Ok, he drained all the oil. How much came out? How much did he put back in? (quarts, litters?)

 

Lots of talk, lots of hand wringing, lots of advice, no information.

 

Yes totally agree with rifle driver and ferrarium.... once you learn your cars consumption habits if any then you can adjust how often you check the oil. For me it's about every six months or so and I still have not really ever added more than a pint.

 

In the case of 348, the manual recommends checking oil level every 500 km. As the specified oil consumption for the 355 is 1-2 Lit. per 1000 km, and as 2 Lit. is the oil volume between the max & min marks, oil level on the 355 should also be checked every 500 km (when you may have to add as much as 1 Lit.).