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Re: 403 in a U

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Author  [Modern View]

08-29-2012 19:15:50

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There are 2 ways to go.

1. Put crank, rods, blocks and heads on the U crankcase, use the U starter flywheel.

2. Put entire 403 in U, use 403 power unit flywheel and starter. May have to grind clearance for the starter in the transmission bell housing.

Either way creates problems with water return to radiator. (I solved this by using a diesel return inlet. Turned it upside down. But I was putting the 403 in a U diesel. May be hard to find, only 700 diesel Us were made.)

Another problem to overcome was the water bypass. I ran a tube up to the extra pipe plug in the U water manifold. I think some people just plug it off. If you want a temperature sensor in the return manifold you may have to be creative to make it fit under the hood.

The U radiator may prove to be marginal if you intend to work it. For a few minutes pulling it should be o.k. Mine could pull the bog in 4 th gear, but would soon boil the water. An extra thick core in the radiator helped some, but its still marginal.

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08-30-2012 08:56:32

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 Re: 403 in a U in reply to t.r.k., 08-29-2012 19:15:50  
an alternative solution would be an aluminum car radiator with an electric fan. MMs tend to be rather heavy anyway and this would help alleviate that.

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08-30-2012 15:13:35

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 Re: 403 in a U in reply to bp4455, 08-30-2012 08:56:32  
We used an aluminum drag race radiator and electric fan for my UB. Its all mounted in the original metal shell where the old radiator was. Radiator shop did the Fab work and turned out awesome. Bolted right up like it belongs there.

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