Hi there,

when starting my 110 (1987 2.5 N/A diesel ex military) I have the following issue.

1. Turn key and hold on glow plug warm for a few seconds, then turn to start. Engine turns once, then makes a squealing sound and wont turn anymore.

2. Repeat - same thing on second try.

3. On third try engine fires up and Landy drives normally.

This problem started a couple of weeks ago and initially was just in the mornings. Now, it is every time you start even if she's just been running and the engine is warm. I have tried two batteries and they give the same result (although neither are new, they could both be weak). Could this be time for a new starter, or possibly something inside the engine itself?? Thanks..

likely the starter,or failing cable ,poor earth

Possibly the starter solenoid isn't working correctly and not throwing the dog gear in.
Try and post a video up of the noise.

Check the little wire on the starter.
Loose or dirty connection.