Just a little useful (?) information.

Had the starter on my jeep (Bosch) go out.
It is in a similar location to a 617 turbo.

Total PITA to remove. The heat shields are as sharp as a razor.

Turned out that the nut on the bolt on the solenoid that has the wire that goes into the starter had been loose for some time. It had been arcing & so the corrosion had eventually stopped the connection.

I used a new nut & spring washer as well as a clean up with the dremil.

I have never had this problem before on a starter. I have had the main lead come loose on starters before.
Its all back together now & working like a charm.

After this I went & checked every starter here. About 1/2 of them had the equivalent nut a bit loose. It looks like the continual heat cycles over time making the copper wire squash may cause the nut to become loose.

If you are doing anything in that area of your car, its worth just checking that its tight.
Its not a nice feeling when you are miles from home, turn the key & have the starter hesitate & die.

__________________
Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving