AC Fuel & Vacuum pump casting numbers

BCA · Post by **BCA** » Tue Sep 29, 2015 2:33 pm

I have seen recent reference to AC fuel/vacuum pump casting numbers which may be model numbers but are not referenced in any M38 or M38A1 ORD7/8/9 parts books. A review of Ord7/8/9 books reveals many various pumps for M38 and A1: at least 11 by specific part number! So I went through my stock of pumps: the following casting numbers show up on the mounting flange: No hand primer: 9917. With hand primer: 4260, 4260JJ, 4069, 4535, 9810 and 9997. Is there a chart related this apparent AC casting number to the various numbers as they appear in the parts books? ......... Brian

Post by **wesk** » Tue Sep 29, 2015 10:41 pm

Hello Brian,

The AC fuel pump numbers on the flange are the last 4 digits only of their full AC number in the ORD 9. Don't ask me why AC did it that way.

As for a chart. Here is a beginning for one:

No hand primer:
9917 = 1539917 Pg 72 of M38 ORD 9 and pg 29 of M38 ORD 8 ORD# 8330132
9585 = 1539585 Pg 72 of M38 ORD 9 and pg 29 of M38 ORD 8 ORD# 7375380 {This pump is also listed TM 9-2320-208-20P (M38A1 Org Maint Parts List as FSN 2910-547-7769 ORD# 8720569)}
2659 = 5592659 Pg 73 of M38 ORD 9 ORD#
2147 = 5592147 Pg 73 of M38 ORD 9 and pg 29 of M38 ORD 8 ORD# 8329527
With hand primer:
2655 = 5592655 Pg 29 of M38 ORD 8 ORD# 8332073
3209 = 5593209 Pg 29 of M38 ORD 8 ORD# 8333104
3249 = 5593249 Pg 29 of M38 ORD 8 ORD# 8720569
4260 = 5594260 Pg 83 of M38A1 ORD 9 ORD# 8720570
4260JJ I think the JJ is a mod level or alteration stamp on a basic 4260
4069 = 5594069 Pg 82 of M38A1 ORD 9 ORD# 8720569
4535
9810 = 1539810 Pg 82 of M38A1 ORD 9 ORD# 8329705
9997

I would guess 4535 & 9997 were produced by AC after the last IPL which would have been after 1966.

Post by **wesk** » Tue Sep 29, 2015 11:43 pm

Here's an old list form a post of mine on the G503;

Postby Wes K » Fri Sep 15, 2006 3:09 pm

Hello Keith,
The original factory pump by the ORD 9 SNL G758 1956 is:

AC# 1539810 WO# 805727 ORD# 8329705

The supersedures are:

AC# 5594069 WO# 810289 ORD# Unk

AC# 5594260 WO# 908715 ORD# 8720570

The M38A1 ORD 8 SNL G758 1959 and 1966 list one service pump:

AC# Unk? WO# Unk? ORD# 8720569 FSN 2910-547-7769

____________________________________________________________

The M38 ORD 9 SNL G740 1955 lists the original M38 pump:

AC# 1539585 WO# 800350 7375380 For engines thru sn MC74419

AC# 1539917 WO# 807641 ORD# 8330132 For engines after sn MC74419

Then these service replacements are listed:

AC# 5592147 WO# 119483 ORD# Unk For engines thru sn MC74419

AC# 5592659 WO#120208 ORD# 8329527 For engines after sn MC74419

The M38 ORD 8 SNL G740 1956 lists 6 pumps (no 's):

AC# 1539585 ORD# 7375380 WO#Unk? WEU G758-8720569

AC# 5592147 ORD# 8329527 WO#Unk? WEU G758-8720569

AC# 1539917 ORD# 8330132 WO#Unk? WEU G758-8720569

AC# 5593209 ORD# 8333104 WO#Unk? WEU G758-8720569

AC# UNK ORD# 8720569 WO# 120933

_____________________________________________________________

Based on the available data I am confident any of the above pumps will work on the M38 and M38A1. As for which is correct I would assume the first pump shown in each model's ORD 9 would most likely be the factory original. That is if you don't have any more definitive factory data that you can research.

There are a few civvy dual pumps that will work but use tube nipples instead od threaded tubing and pipe openings.
Wes K
45 MB, 51 M38, 60 CJ3B, 60 CJ5, 76 DJ5D, Bantam T3-C MVPA22099

BCA · Post by **BCA** » Wed Sep 30, 2015 5:12 am

Thanks so much for clearing up the casting numbers. I wouldn't qualify to work at Bletchley Park having missed that fairly obvious code.

Post by **wesk** » Wed Sep 30, 2015 9:57 am

The one oddity in the bunch is this one:

9585 = 1539585 Pg 72 of M38 ORD 9 and pg 29 of M38 ORD 8 ORD# 7375380 {This pump is also listed TM 9-2320-208-20P (M38A1 Org Maint Parts List as FSN 2910-547-7769 ORD# 8720569)}

It is listed in the 66 edition of TM 9-2320-208-20P for the M38A1 as a cross reference for the later FSN & ORD#.