Engine hose specificaitions

[Geoffreykwright]

Hi - quick favour to ask.  I need to replace a couple of hoses.  I've got a M35-B.  The (short) hose from the manifold to the thermostat and the hose from the water pump to the heat exchanger.  I need the length and diameter of the hoses - I could take them off an measure, but would prefer not to take them off until I have replacements at hand (if I take the existing ones off I am not sure I'll get them back on).

Does anyone know the length and diameter of these hoses off hand?  I could not find these specs in the manual.

Thanks in advance. 

[Ron Hill]

Geo : I believe that the specs will give you the diameter, but not the length.  The raw water hose from the pump to the HX should be nylon reinforced so just roughly measure, then add an inch or two and you should be OK. 

On my M25XPB engine similar to the M35BC, I took both the inlet and the output hoses from the raw water pump and ran both of them up from the pump directly aft on the upper port side of the engine - one to the HX and other (inlet hose) around the corner to the thru hull.  I incased both in a piece of clear plastic water hose (a conduit) to protect them. That way I could easily change my drive belt without having to remove hoses.                   
Something to think about!!   

A few thoughts

[Geoffreykwright]

Geo : I believe that the specs will give you the diameter, but not the length.  The raw water hose from the pump to the HX should be nylon reinforced so just roughly measure, then add an inch or two and you should be OK. 

On my M25XPB engine similar to the M35BC, I took both the inlet and the output hoses from the raw water pump and ran both of them up from the pump directly aft on the upper port side of the engine - one to the HX and other (inlet hose) around the corner to the thru hull.  I incased both in a piece of clear plastic water hose (a conduit) to protect them. That way I could easily change my drive belt without having to remove hoses.                   
Something to think about!!   

A few thoughts

Ron - thanks.  I'll check again on the diameter spec.  Length I am ok with.  the hose from the manifold to the thermostat is short - but it's "painted" so can't see the ID/OD.  I'm ok getting them a bit long and cutting down if needed.

[KWKloeber]

Geo

Are you talking Hx to the seawater pump or the coolant pump?

There's sizes in the parts manual. I recall there is a date break on the thermostat hose - different hose depending on the date. Wb changed the size the the thermostat and housing over time!

[Dave Spencer]

Geoffrey,
I have an M35A but here are the measurements you're asking for

The short hose from the manifold to the T-stat is 7/8" about 9" long. It's harder to find 7/8 hose than other sizes. I got mine from Marine Outfitters in Kingston.  Regarding the hose to the heat exchanger, if it's the water hose running along the stbd side of the engine, it's 5/8 and about 22" long. If it's the coolant hose running along the port side, it's 7/8" about 24" long.
Hope that helps.

[Ron Hill]

Geo : I dusted off my brain and the raw water hoses are 5/8" diameter.

A thought

[Geoffreykwright]

Ron, Dave - thanks.  Very helpful. 

[Geoffreykwright]

Hi again - I am struggling on the short hose from the manifold to the thermostat (see picture - the one with the arrow pointing at it).  A couple on this forum said its 7/8" ID.  The OD is 1 1/2" so I not sure this is right.  Unfortunately the hose is painted so i can't see any markings.  I called Catalina Direct tech support.  They do not stock this part specifically, but said 1 1/8" is the ID.  No one in Toronto seems to stock that diameter hose - its very rare.  I've gone thru my manuals and can't find reference to any hose diameters.  Any thoughts?

Universal M-35B; Hull #1494; built 2000.

Thanks in advacne.

[Geoffreykwright]

ANother view of the hose in question...

[Ron Hill]

Geo : From the illustration it looks like that is a wire reinforced or a pre formed hose.  You might give Westerbeke a call @ 508-823-7677

Why are you replacing that hose ?

A thought

[Dave Spencer]

Geoffrey,
I'm standing in my boat looking at the hose is question now. I measured the OD as 1 3/8" so you're measurement of 1 1/2" isn't far off. The hose I used when I replaced the coolant lines a couple of years ago is Trident #100 0780 7/8" diameter. There's an SAE mark on it but it's smudged and I can't make it out. SAE J??06.
I have an M35A, not the M35B that you have but I highly doubt there would have been a change in hose size here.
Should be easy but nothing's easy on a boat!   

[Geoffreykwright]

Geo : From the illustration it looks like that is a wire reinforced or a pre formed hose.  You might give Westerbeke a call @ 508-823-7677

Why are you replacing that hose ?

A thought

Ron - that's it - looks like a pre-formed wire-reinforced hose.  Its painted so I can't read any specs on the outside.  Reason I thought to replace it is it's looking brittle around the hose clamps - looks like some cracks - but it could be the paint cracking.  I am nervous to remove it to inspect it in case I can't get it back on and not get a replacement.  Good suggestion - I'll try Westerbeke.

[Geoffreykwright]

Geoffrey,
I'm standing in my boat looking at the hose is question now. I measured the OD as 1 3/8" so you're measurement of 1 1/2" isn't far off. The hose I used when I replaced the coolant lines a couple of years ago is Trident #100 0780 7/8" diameter. There's an SAE mark on it but it's smudged and I can't make it out. SAE J??06.
I have an M35A, not the M35B that you have but I highly doubt there would have been a change in hose size here.
Should be easy but nothing's easy on a boat!   

Dave - thanks.  Sounds like we're talking about the same thing.  Catalina does not seem to stock a hose described as "Manifold to Thermostat" for the M-35B (but the do for other engines).  I called Catalina tech support and they explained they are only starting to supply replacement hoses.  They said the ID on my hose is 1 1/8".  My local engine parts supplier (biggest in Toronto) does not even stock 1 1/8" since its so rarely used.  Catalina Direct DOES stock a 1 1/8" hose described as "Manifold to Heat Exchanger" (Part #: Z5049).  Wondering if that might work.  I'll certainly take Ron's suggestion and call Westerbeke.

[Dave Spencer]

Sure enough, the M35A and B models are significantly different in this area. Here's the M35B parts manual showing the hose as 1 1/8".

http://c34.org/wiki/images/e/e1/201021_parts_manual_m25xpb-m35b-m40b_revision_2_final.pdf

Mine is definitely 7/8". Neither are common hose sizes. I had the same trouble you're having sourcing the hose locally. It looks like Marine Outfitters in Kingston has 1 1/8" just as they had the 7/8" when I got it from them several years ago. It might be faster and easier to have the hose come from Just up the 401 instead of California.
https://www.marineoutfitters.ca/mobile/?page=shop&category=10025|10388|11374&product=56565716

[Ron Hill]

Geo : Have you looked at exhaust hose? Shields makes some that is wire reinforced with an ID of 1 1/8".

A thought