Valve guides (bushings) part number changes to a 4H0621 at s/n 9U17,207 up.
Valve guides (bushings) part number changes to a 4H0621 at s/n 9U17,207 up.
I see several heads that can use either the 4F6949 or 4H0621, used on 9U1- 29764 and 7U1-44307 and others.
The 4F6949 and 4H0621 guides are quite a bit different, but they are both used in the same head assemblies, and with the same valves and springs in both. Looks like the 4H0621 is a one piece guide, but the 4F6949 also requires an additional part, spacer 5F3110 if you were going to replace the 4H0621 with 4f6949.
The 4F6949 and 4H0621 guides are quite a bit different, but they are both used in the same head assemblies, and with the same valves and springs in both. Looks like the 4H0621 is a one piece guide, but the 4F6949 also requires an additional part, spacer 5F3110 if you were going to replace the 4H0621 with 4f6949.
The heads on a 318 are as tuff as any you will find, but it still may have been changed in 60 years. So the head may be the earlier type, so check before looking for other guides.
What do you mean by the earlier type? My parts book is from 9U13263 up, all of the heads are the same number in there. Was there a different style before those serial numbers?
Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.
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