8n Ford Trans/Hyd/Diff Fluid

[Joey H]

I am restoring a '52 8N Ford and was wondering about what type of fluid I should use for the transmission, hydraulic and differential. The book I have says SAE 90 but I am afraid of what it will do to my hydraulic pump. I was also wondering which of those reservoirs where tied together and what their capacities are for each? Any help would be much appreciated. Thanks!!

 

[TheOldHokie]

(quoted from post at 13:55:20 01/31/11)
I am restoring a '52 8N Ford and was wondering about what type of fluid I should use for the transmission, hydraulic and differential. The book I have says SAE 90 but I am afraid of what it will do to my hydraulic pump. I was also wondering which of those reservoirs where tied together and what their capacities are for each? Any help would be much appreciated. Thanks!!

SAE 90 gear oil is the original OEM specification and will not harm th epump. In fact it may actually improve the opertaion of the lift if it is worn and leaking. This subject has been debated ad nauseum in the past - here is a link to a recent discussion that I think covers the particulars:

Hydraulic Oil Discussion

TOH

 

[souNdguy]

ditto what TOH said.

the reason that oil was printed in the book is beacuse that's what that scotch yoke piston pump was designed to use.

soundguy

 

[gahorN]

Joey... if you are "restoring" a 8N and are puzzled about the tranny-fluid....then you probably should STOP what you are doing, get the IT FO-4 book and a few others, and READ from cover-to-cover ...before you make a single-turn on another wrench.

SAE 30 motor oil, and SAE 80/90 gear oil, properly diluted antifreeze solution, and plain water are all the fluids you'll ever need to operate a Ford. (Well...OK...maybe beer.....) :lol:

 

[HCooke]

Trans, hydraulics and rear end are common. Three drain plugs. One fill openning on top of trans.

 

[DollarBill]

[b:8969ec1af4]I was also wondering which of those reservoirs where tied together and what their capacities are for each? Any help would be much appreciated. Thanks!! [/b:8969ec1af4]

Common sump for all three cavities.

Three drain plugs - Start with the differential and work forward. Fill cap is just to the left of the gear shift.

Common recommendation is to remove the lowest bolt that holds the inspection cover on for the hydraulic oil dipstick. When oil runs out that bolt hole, it's full. Should take somewhere between 4-5 gallons depending on how much gunk there is stuck to the castings.

Not sure where you live but if you're in a warmer climate, probably should use 90Wt GL-1. If you live where it's cold and your lift is in good shape, try the 134 spec.

 

[lha]

I use the m-134d hyd oil,bought from Walmart.Tsc,Walmart,other places have all the same thing.in the summer,winter,fall,spring.The last time I removed the top cover,the gears looked like new,and the pump also.It would have to be really hot to be too hot for the utf.The oil circulates pretty well with movement of gears,etc,and stays fresh,settling in the pump sump.That's where it is moving less,and is lower.I check the fluid often for color,feel,etc,and when I have a doubt,It's time for a change.I also rigged a cover for the control spring from sheet metal,as part of the time it's outside.---lha