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Old 02-21-2023, 08:27 AM
DieselScout DieselScout is offline
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Join Date: Aug 2014
Location: Upstate, NY
Vehicle: 1982 245-GL D6, 1982 244-GL D6
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Default Head Cracks Between Valves

Below are measurements of cracks between the valves on an old D24T head.

Measurements of cracks using caliper and magnifying glass:
Cyl. 1: 0.59mm
Cyl. 2: 0.67mm
Cyl. 3: 0.49mm
Cyl. 4: 0.40mm
Cyl. 5: 0.57mm
Cyl. 6: 0.60mm

Measurement of cracks using feeler gauges:
Cyl. 1: 0.65mm
Cyl. 2: 0.60mm
Cyl. 3: 0.43mm
Cyl. 4: 0.40mm
Cyl. 5: 0.63mm
Cyl. 6: 0.43mm

Average Measurements of feeler gauges and caliper.
Cyl. 1: 0.62mm
Cyl. 2: 0.63mm
Cyl. 3: 0.46mm
Cyl. 4: 0.40mm
Cyl. 5: 0.60mm
Cyl. 6: 0.51mm

Any thoughts on these cracks?
The book spec specifies no greater than 0.50mm.
How critical is that limit?

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Old 02-21-2023, 10:01 AM
ngoma ngoma is offline
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Join Date: Nov 2009
Posts: 1,351
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Common rule of thumb is you're good to go up until a nickel can fit in the crack (edgewise).
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1985 744 gle d24t
1985 745 gle d24t
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