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Found the problem! Previous owner installed straight- cut ring gear which every no and then fails to engage depending on heat. Ive replaced with OEM directional gear (made in Germany)

all good now.

Took a pic of my ring gear. All seems fine to me - anything unusual you guys can see?

Please troubleshoot with me why a new reduction gear starter will fail to engage the ring gear when the engine is hot?

Part number: 7121090050 for sale.
Recently serviced this starter at local Bosch workshop here in CapeTown and was advised that bendix drive is approaching end of life. It has not failed me yet but I cannot take chances since it is a working truck and decided to replace it with a eduction gear ...

Also went through some starter woes lately. Pinz started beautifully when cold but the bendix kept on slipping when hot. Decided to bite the bullet and import one of Scott's reduction gear starters to South Africa. The starter arrived three days after ordering (excellent service!) - I just finished ...