Exhaust Manifold Replacement / Repair

[Seah0rse]

I have a 50 year old 60 hp Ford Tractor engine marinised by Parsons and the exhaust manifold is corroded and needs replacement I am told or, at least, extensive repair. The engine plate fitted by Parsons reads FH4M 11816 6830.

Does anyone have any suggestions where I might be able to source such a thing? So far I have tried Lancing Marine who suggest a replacement with FM420 and Mermaid Marine in Poole and a search on this Forum.

Thanks for all help and suggestions.

 

[coopec]

I have a 50 year old 60 hp Ford Tractor engine marinised by Parsons and the exhaust manifold is corroded and needs replacement I am told or, at least, extensive repair. The engine plate fitted by Parsons reads FH4M 11816 6830.

Quite possibly you could make one up yourself if you can weld (or if you have a mate who can weld) and you have appropriate machine tools. A friend and I made up an exhaust manifold for a David Brown Tractor but that wasn't water-jacketed. (It isn't fancy but works fine!!)

If you go to a machine shop they will charge an arm and a leg.

 

[charles_reed]

If it's a standard 4 cylinder Fordson Major engine and you really need an exhaust manifold and not a heat exchanger, I'd suggest a breakers's yard in an agricultural area. Plenty round here in Shropshire and in deepest rural Essesx.

 

[vyv_cox]

I am not familiar with the engine and cannot quite make out from the pic if the manifold is water cooled. If not, then as Charles says, spares are available. If it is water cooled I suspect that repair is not possible as it looks like an iron casting. In this case you have a couple of options:
1. Completely fabricate a new one as coopec suggests, welding everything from new metal. A good fabrication shop could do it but it might cost.
2. Do away with the water cooled manifold, reverting to the standard one if that is uncooled, then spike water in to the exhaust as with most modern engines. This is how my BMC was converted, water coming down the right hand arm and into the fabricated manifold.

 

[Jcorstorphine]

From your pic, I would say that the original is water cooled as there are what looks like a 1" inlet and outlet at the top. The fact that is also square is reminiscent of BMC type of sea water cooled engines built in the 50s early 60s.

Other than trying to weld the existing one which looks to be beyond its "use by date" you could fabricate one using
1 1/2" malleable iron screwed fitting such as GF Tees and Elbow along with screwed ends on tubes. You might even look at brazing a copper coil round the tube parts to keep the temp down.

I have used these for years to fabricate exhaust elbows on a couple of conversions and they has sat water being sprayed into them.

The other (remote) possibility is to contact Barr Marine in the US who make aftermarket water cooled manifolds for a number of engines. If you were to measure the pitch of the exhaust ports on you engine, there may be one which (by chance) is close

Web site http://www.barrmarine.net/manifolds.html

 

[Seah0rse]

Yes you are right Jcorstorphine, water cooled, all as you say, and also water injected into the following flexible exhaust. Your suggestions are beyond my skill set and outside my contact list. I'll look at barrmarine tho. Thank you for your post.

vyv Are you suggesting that the manifold does not need to be cooled by water? Here is an overall picture of the engine

 

[NormanS]

The exhaust manifold on my Gardner was dry, but it did get pretty hot. The dry hot gases were led up in a lagged pipe to a high-up mixing chamber, where the cooling water was introduced, and then, by hose, to the stern. For the same engine (6L3), Gardner did make a water cooled manifold, but they were reputed to give a lot of bother. If you are going to make, or have a manifold made, it would be much easier, and cheaper, to go for a dry one. Some people installed a sheet metal heat shield on theirs.

 

[vyv_cox]

vyv Are you suggesting that the manifold does not need to be cooled by water? Here is an overall picture of the engine

I suspect, but cannot say for certain, that the original exhaust manifold was not water cooled on an elderly engine like yours. That is definitely true of my BMC, and NormanS' Gardner. If it was possible to obtain a used manifold from a scrapyard, which presumably would not be water cooled, you could probably cobble up a way of using it, at the price, as suggested by NormanS, of higher temperatures.

 

[coopec]

View Full Version : DIY Water cooled Exhaust manifold?

SPARK1
04-01-2011, 09:51 AM
Is it possible to make your own water cooled exhaust manifold? Could you weld one up from plate and pipe? Has anyone done this for a engine in the 5-8 liter range?
Also water injected exhaust?(wet exhaust)

http://www.boatdesign.net/forums/archive/t-37447.html