M25 Coolant Hose Elbows

[KWKloeber]

Post a picture of what pump and elbows you have. The correct elbows are (depending on the pump used) 1/2" NPR x 5/8" hose or 3/8" NPT x 5/8" hose.

I prefer straight-in if they fit the engine compartment but on the 30 you can wrestle in a straight-in and a 90 outlet.

[Catalina007]

Post a picture of what pump and elbows you have. The correct elbows are (depending on the pump used) 1/2" NPR x 5/8" hose or 3/8" NPT x 5/8" hose.

I prefer straight-in if they fit the engine compartment but on the 30 you can wrestle in a straight-in and a 90 outlet.

On the raw water side its an Obendorfer which currently has a 1/2 hose barb.  So I understand I just need to figure out what size the NPT thread  fitting is on the pump (which seems to be either 3/8  (hard to find bronze ) or 1/2 ,  and get that fitting with a 5/8 hose barb, then its a straight shot  with 5/8 hose to the 5/8  raw water Heat Exch intake  fitting.

The elbows are needed on the fresh water pump 1 inch fitting to a 90 degree turn under the alternator to a 7/8 elbow and 7/8 fitting on the Heatxch FW. The 1 inch to 7/8 hose reduction happens at the elbow on the pump end. I read this should be wire reinforced but seems everyone is using normal heater hose which is what is on there now.   

https://www.amazon.com/GROSS-MECHANICAL-ADAPTER-PIPE-HOSE/dp/B000FOYDVI

   

[KWKloeber]

That hose barb isn't a good choice.  That picture is incorrect for that fitting.  when you find out the NPT let me know - email me from here or PM me on the GIO forum.

You appear to have a newer pump (smooth, flat cover) which would be either an N202M-15 (1/2") or N202M-16 (3/8".)  Unfortunately, Ob doesn't stamp-in model numbers and the tag (on a cover bolt) typically disappears.

I like running the outlet hose down to the stringer and up to the HX to avoid the constant PITA interference w/the outlet hose at the dipstick when checking oil level.

The suction hose to the coolant pump needs to be wire-wound.  Both the 7/8" (ShieldsFlex 250 series) between the Hx and ell and the 1" to the pump.  That hose p/n is in this thread.