5mt oil cooler

Flywheel, Clutch, Transmission, Axles, etc...

Moderators: Helpinators, Moderators

Post Reply
mTk
no title
Posts: 1316
Joined: Sat May 03, 2003 6:29 pm
Location: spfld, il

5mt oil cooler

Post by mTk »

Are there any option availible to cool the fluid in the 5mt? I think i read somewhere that the 5mt has no fluid pump (a feature only in the 6mt)

MK
1992 BC672 AWD 5MT
vrg3
Vikash
Posts: 12517
Joined: Sun Nov 03, 2002 2:13 am
Location: USA, OH, Cleveland (sometimes visiting DC though)
Contact:

Post by vrg3 »

Yeah, the 5MT's fluid isn't pumped anywhere; the gears all just turn through it. I suppose you could add a pump to carry the fluid out of and back into the differential; I haven't seen the inside so I don't know if there's a good spot to add a pickup or not.

Are you worried about your gear oil overheating? I don't think I've ever heard of that happening on a Subaru 5MT.
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
mTk
no title
Posts: 1316
Joined: Sat May 03, 2003 6:29 pm
Location: spfld, il

Post by mTk »

I'm currently running 40w dino oil, not sure if it would run hotter or not, i suppose there is less friction since it is thinner, so less heat?

MK
1992 BC672 AWD 5MT
vrg3
Vikash
Posts: 12517
Joined: Sun Nov 03, 2002 2:13 am
Location: USA, OH, Cleveland (sometimes visiting DC though)
Contact:

Post by vrg3 »

40W gear oil? Or 40W motor oil?

Why wouldn't you just use 75W90?
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
mTk
no title
Posts: 1316
Joined: Sat May 03, 2003 6:29 pm
Location: spfld, il

Post by mTk »

http://bbs.legacycentral.org/viewtopic.php?t=15752

Motor oil. I have soem 75w90 royal purple gear oil.. but so far the 40w has been excellent.

MK
1992 BC672 AWD 5MT
vrg3
Vikash
Posts: 12517
Joined: Sun Nov 03, 2002 2:13 am
Location: USA, OH, Cleveland (sometimes visiting DC though)
Contact:

Post by vrg3 »

Hmm... I'd be wary of running motor oil for extended periods of time in a gearbox; gear oils have additives to help them avoid shearing between gear teeth and stuff like that.

40-weight motor oil is actually similar in viscosity, I think, to 75W90 gear oil. Maybe a little thicker, actually. Gear oils and motor oils are measured on different viscosity scales:

http://www.irvingoilco.com/images/viscosity.gif
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
mTk
no title
Posts: 1316
Joined: Sat May 03, 2003 6:29 pm
Location: spfld, il

Post by mTk »

Ah, it does seem pretty close to the 75w90. I'll probably be trying out the royal purple next week when i do my shift linkage and exhaust.

MK
1992 BC672 AWD 5MT
Post Reply