Piston scoring D-21/210/220/7030 engines

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   Thank you, David. Here are two pictures of the current 220 I'm working on. The 1/2" belts are bottomed in their grooves causing fan speed reduction and lower coolant flow which can lead to possible over heating on a warm day at 100% load. The alternator charging at 100% output can also have belt slipping issues. Changing to "B" width belts pretty much solves the slippage problem and especially on 50 year old pulleys. Another problem we have here is someone (not very knowledgeable) in the past has installed a fan spacer that moves the fan forward to within an inch of the radiator. This makes it impossible to work on and air flow is actually reduced, causing more potential engine over heating. This change may have been an effort to combat an over heating engine on a hot day?? One might think moving the fan closer to the radiator core would draw more air thru the radiator, but the reality is that's not the case. Max air flow is achieved when the tips of the fan blades are 50% in and 50% out of the shrouds edge.

Edited by DrAllis - 5 hours 46 minutes ago at 7:20am

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DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 22611	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 6 hours 37 minutes ago at 6:29am
	Thank you, David. Here are two pictures of the current 220 I'm working on. The 1/2" belts are bottomed in their grooves causing fan speed reduction and lower coolant flow which can lead to possible over heating on a warm day at 100% load. The alternator charging at 100% output can also have belt slipping issues. Changing to "B" width belts pretty much solves the slippage problem and especially on 50 year old pulleys. Another problem we have here is someone (not very knowledgeable) in the past has installed a fan spacer that moves the fan forward to within an inch of the radiator. This makes it impossible to work on and air flow is actually reduced, causing more potential engine over heating. This change may have been an effort to combat an over heating engine on a hot day?? One might think moving the fan closer to the radiator core would draw more air thru the radiator, but the reality is that's not the case. Max air flow is achieved when the tips of the fan blades are 50% in and 50% out of the shrouds edge. Edited by DrAllis - 5 hours 46 minutes ago at 7:20am

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