OK -Boring another (different) oil thread

[rick130]

[snip]

75w90 is far too thick for the pump to pickup properly. Another option is for a full synthetic engine oil like a 0w40 or 50 Mobil1. The beauty with the BW is that there is not a lot of load on most components other than the roller bearings and the Morse chain and a synthetic engine oil has the lube ability to cope with the chains requirements. However, if your in a cold climate, even with a 0w oil, it may still suffer cold pickup starvation.
I would maybe look towards a synthetic ATF but with no direct frictional wear, you shouldnt get any discolouration at all.
[snip]

Cheers

Andrew

Andrew, a 75W-90 gear or manual trans lube's kinematic viscosity is equivalent to a 5W-40 engine oil.
A 70/75W-80/85 is equal to an xW-30, and an ATF is equal to an xW-20 engine oil.

Phillip, I wouldn't add any moly, you already have a really good fully formulated oil.
MoS2 it's not a cure-all and is only really effective when boundary layer lubrication breaks down in high pressure/high scuff situations, eg lifters on a flat tappet cam or CV balls and grooves.

BITOG is good, but there's a lot of **** on there these days too, the really knowledgeable people don't post there much at all anymore.
Search out articles by Molakule or posts by Bruce381, (both tribologists) old posts by Terry Dyson (who unfortunately doesn't post there anymore)

[PhilipA]

I think I may have worked it out , while half awake in bed!!

The most logical explanation is that the seal on the viscous coupling is leaking and letting the silicone stuff into the main TC oil.

Seeing there are no noises , no chain slop,no jumping sprockets,etc, etc, and it has been doing it for about 60KK at least, It is the only thing I can think of that would be non destructive, is that.
Not a good result as means a new viscous reasonably soon, but that can be done "in situ"
Regards Philip A

[LOVEMYRANGIE]

I think I may have worked it out , while half awake in bed!!

The most logical explanation is that the seal on the viscous coupling is leaking and letting the silicone stuff into the main TC oil.

Seeing there are no noises , no chain slop,no jumping sprockets,etc, etc, and it has been doing it for about 60KK at least, It is the only thing I can think of that would be non destructive, is that.
Not a good result as means a new viscous reasonably soon, but that can be done "in situ"
Regards Philip A

Could be. Drop your front propshaft and give it the twist test for lockup. If you dont bust a gut or give yourself a hernia, its probably the cause! A lack of oil will make it easy to spin. Just depends how much its lost.

[PhilipA]

The Viscous works perfectly. I turned it several times when removing and replacing the UJs last week and it performed flawlessly.

IE I placed a large screwdriver across the UJ and turned the driveshaft with TC in neutral. It was relatively easy to turn slowly but much harder to turn quicker with no hard spots. AFAIR, the same as it has always been, so maybe the leak is very slow.
Regards Philip A

[PhilipA]

Went up to Stockton yesterday for the annual beach cleanup with the Discovery club.

The old Rangie performed superbly. No noises , just great performance.

BTW my RD694s are FAR superior to BFG AT KO on sand.

In 31C degrees, with following wind on the beach that was cut up by many 4WDS, no movement in the temp gauge in second at 2200-2600RPM, so I reckon my 10 year old radiator core is still A1.

I always hold the trans in second high to get revs over 2200 which is when the Torque converter is as locked up as it gets, and no overheat lights at all.
Regards Philip A
If you are not sure that your radiator is good, this is about the ultimate test. Just take her on the beach on a hot day and run in the soft sand. If teh temp moves ove rhalf, then you have problem with the viscous fan and/or radiator

[ashtrans]

Hi Phillip,

the oil discolouration may be due to one of 2 reasons,

'lovemyrangie' it right that the chains rub and machines the inside of the casing when they get worn and this will turn the oil grey with the ali paste and is usually accompanied with a growling at speed when you come off the gas and are coasting, (FYI they do have a breather though)

the other reason is just heat, they run very hot, especially where you are and this will cause the ATF oil to darken,

Dave

[LoveMyV8County]

Hi Phillip,

the other reason is just heat, they run very hot, especially where you are and this will cause the ATF oil to darken,

Dave

Yep, this was my first thought too.