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I recently purchased this 1985 B6100D with a 1630 front end loader and a B670 backhoe. 615 hours on it. It appears to be in good condition as I was told it’s been garage kept its entire life from previous owners. My first upgrade is to find a block heater to help with starting on the colder days here in NJ.
Make certain your glow plugs are working. The glow indicator should become noticeably hot if observed out of the sun. This is in the pre heat position.
When the key switch is turned to the START position the glow indicator is bypassed and power flows directly to the glow plugs.
Each glow plug with its wire disconnected should measure around 1 ohm between the end terminal and the block. All three should measure close in value.
Sometimes key switches get replaced with incorrect ones by someone who dos not understand the important function it plays in GP operation.
The engine does not have a water pump. Its cooling system is a thermo syphon one which circulates coolant using different temps.
Look on the end of the radiator overflow tube and you may find a whistle. The whistle sounding is a warning the engine is getting too hot.
A friend with a B7100 living in Canada where it gets quite cold could start his on very cold days just using the GP's.
Dave