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4th gear failing to engage.

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Warthog1959:
My engine has recently been rebuilt and is running well. However it is failing to engage into 4th and has to be put back into 3rd to engage drive. Is this likely to be clutch adjustment?

LesterPiglet:
No. The clutch will affect all gears equally. What was rebuilt and has this problem been there since the rebuild or happened after a while?

hairygit:
No, sadly not, this sounds like a selector fork/drum or thrust washers between gears problem :(

Warthog1959:
The entire engine was rebuilt, This is the 1st ride. This needed doing because there was a crack in the crankcase in front of the front sprocket. 4th gear worked before the build, however was subject to the occasional false neutral. All bearings and seals were replaced. Clutch pressure plate was replaced as this was functional but broken.

hairygit:
Did you inspect the dogs on the gears while it was apart, also the wear on the selector forks (I would hope you paid particular attention to the wear patterns on the forks if it was previously giving trouble!) Were the gear clusters dismantled? was a thrust washer lost/omitted/broken up into tiny bits?

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