Which radiator core? - Diesel Forum - TheDieselStop.com
6.9L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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post #1 of 2 (permalink) Old 04-29-2017, 02:00 PM Thread Starter
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Which radiator core?

1987 6.9 with air....... Is there a way to determine which radiator core I need to order without taking it out and measuring/ inspecting? rockauto list heavy duty and standard duty cores.

1992 F250, 5 speed, extended cab, replaced 7.3 with 6.9 2-5-08 ...will be replaced with 94 7.3
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post #2 of 2 (permalink) Old 04-30-2017, 01:19 AM
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Standard is probably a single core; HD is probably a 2-core, but in any case, more cores than standard. Check the details on RA to find out how many cores each one has, then pull your radiator cap & look inside. If the coolant is low or clear (weak) enough, you can see the ends of the core tubes sticking through the endplates into the tank. This diagram shows a 1-core radiator:

Or if RA lists the core thickness, you can just measure yours (or eyeball its thickness).

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