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Replacement XU-1 engines
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Mike81973 Offline
#1 Posted : Wednesday, 13 May 2009 10:01:53 PM(UTC)
Mike81973

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can anyone help with what the replacement engines were for both the LC and LJ XU-1 engines.
My theory based on some sketchy information I have is, replacement XU-1 engines had to have a neoprene rear main which led to;

LC XU-1 used 12/69 dated blocks with police numbers stamped acording to the state they came from.
Then as these ran out and 186s were no longer in production 202's were fitted probably with prefix JP and a sequential number of that period used. ( I suspect that these were 1971 dated blocks )

LJ used NP as most people are aware, but I have also been given verbal information that some of the replacements for this period also had state based Police numbers, don't know!
Then there is the last ones that very few people know about, in the later 70's when the NP blocks ran out it appears that the 1971 dated blocks were used for both LC and LJ and Kingswood vehicles that required the neoprene sealed blocks, I have seen both a JP and a QL blocks with 1971 dates but with several years latter sequential engine numbers.
can anyone add to this topic it would be interesting to have more on these elusive XU-1 engines, and may help stop some confusion.
mike81973


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HK1837 Offline
#2 Posted : Wednesday, 13 May 2009 11:02:37 PM(UTC)
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Michael

All I can add is as follows.

Replacement blocks had no numbers from what I understand, and for normal stuff you could only buy block and piston or engines. LJ XU-1 may have been different as the blocks were not cast by Holden (so possibly could have been supplied outside of Holden?). CAC cast them using a different cast material. This applies to both JP and NP prefixed blocks. There have also been a number of NP blocks turn up with an odd R on the engine pad which normally indicates a repeat number, but on these its in the wrong spot and seems to frequent - ive yet to nut this one out. Police numbers as far as Iunderstand were only issued when you went to register a vehicle.
I think youll find why the JP blocks youve seen with later numbers than the casting dates indicate is because the blocks were cast in batches by CAC and used later. Same happened with manual HQ 350 engines. These all are very early cast and US engine numbers but have Holden engine numbers up until HQ manuals finished. Nasco/GMP&A blocks for XU-1 probably would have been the same.
Any replacement engine sold by Nasco for LC XU-1 would not have been JP, JP was only fitted to production LJ XU-1. NK prefix is what would have been sold for LC XU-1 post HQ engine production. Im not sure what any replacement engines sold prior to HQ had on them (never seen a single one of any description). Holden would have kept some NK engines to cover LC warranty, but after that as you say 202s would have been sold (with NP) for LC XU-1 replacement. Nasco/GMP&A engines sold post HQ but for pre-HQ vehicles with non-HQ sumps had prefixes like 186N, 308N. There was no need for a 3100N as NK existed.
Remember QL, QT etc blocks had neoprene rear mains up till some time around 1973/1974 so Q/J/G etc series numbers would have reached Qx500000 or thereabouts by that time. Nasco probably kept some neoprene block and piston kits for neoprene crank engines, but most sold were probably engines so youd just get a rope seal engine to replace the buggered neoprene engine.

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Edited by user Wednesday, 13 May 2009 11:11:45 PM(UTC)  | Reason: Not specified

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Mike81973 Offline
#3 Posted : Thursday, 14 May 2009 3:37:41 AM(UTC)
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quote:
Originally posted by Mike81973
can anyone help with what the replacement engines were for both the LC and LJ XU-1 engines.
My theory based on some sketchy information I have is, replacement XU-1 engines had to have a neoprene rear main which led to;

LC XU-1 used 12/69 dated blocks with police numbers stamped acording to the state they came from.
Then as these ran out and 186s were no longer in production 202s were fitted probably with prefix JP and a sequential number of that period used. ( I suspect that these were 1971 dated blocks )

LJ used NP as most people are aware, but I have also been given verbal information that some of the replacements for this period also had state based Police numbers, dont know!
Then there is the last ones that very few people know about, in the later 70s when the NP blocks ran out it appears that the 1971 dated blocks were used for both LC and LJ and Kingswood vehicles that required the neoprene sealed blocks, I have seen both a JP and a QL blocks with 1971 dates but with several years latter sequential engine numbers.
can anyone add to this topic it would be interesting to have more on these elusive XU-1 engines, and may help stop some confusion.
mike81973


Michael Bell


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Mike81973 Offline
#4 Posted : Thursday, 14 May 2009 8:18:01 AM(UTC)
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Thank you for that information,
The engines with the later sequential numbers that I referred to were a JP 900000 series numbered block with a 1971 cast date, and a QL 700000 series engine also with a 1971 cast date.
( I am checking to see if these are the same month )
The replacement 186 with the 12/69 cast date and number W70***P, I am told this is a West Australian Police number, this engine also had a steel crank which I thought were phased out before this date, except for the LC XU-1 and 186S, but that could have been changed.
Mike81973

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HK1837 Offline
#5 Posted : Thursday, 14 May 2009 4:15:22 PM(UTC)
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That W70****P number was probably put on when it was presented for registration. The car has to be taken to a Police station after getting an inspection, and they issue the number whih is then stamped into the chassis or engine. NSW use NxxxxxP also.

QL7xxxxx on a 1971 block could be explained if the block was old stock that got used up as QL still existed at that time (11/75-11/76 approx for Qx7xxxxx). I cant say ive ever heard of that happening. Are you sure it was 6 x digits and not 5 ie QL7xxxx? JP9xxxxx is as far as I know impossible. That would put it in the range 11/77 to about 7/78 and there should have been no XU-1 built then which is as far as I know the only way a JP block could have appeared. Any replacement engine would be NP prefixed and the N sequence is different to the HQ sequence. In 11/77 to 7/78 range numbers would have been close to NP10000.

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commodorenut Offline
#6 Posted : Thursday, 14 May 2009 4:28:10 PM(UTC)
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W70****P - if it follows the NSW Police numbers, indicates a WA police number issued in 1970 - the foirst 2 numbers being the year.

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Mick
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Mike81973 Offline
#7 Posted : Friday, 15 May 2009 9:00:56 AM(UTC)
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Hi,
Again, you may be on to something with the number of didgits I have checked, sorry I pushed the key too many times the QL number is five didgits QL 755xx.
I do not have easy access to the JP number, but if it was in fact five didgits too what implication would that have?

I have only heard of four didgit NP ( new part ) numbers not to be confused with NxxxxxP numbers for NSW Police.
Mike81973

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Mr.Jones Offline
#8 Posted : Friday, 15 May 2009 5:05:15 PM(UTC)
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QL75xxx would be Oct 71 or thereabouts

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HK1837 Offline
#9 Posted : Friday, 15 May 2009 6:10:32 PM(UTC)
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The J series numbers are in the same engine number range as Q series. So JP9xxxx is about 11-12/71.

NP doest mean NEW PART. N just means NASCO, and P means the same as it does in JP. Nx series numbers started at HQ production at Nx1001. x could be any number as found on HQ-HZ, LC, LJ, HG, LH-LX etc except for maybe the QU 350 engines. Plus early stuff also like 186N, 308N etc. So the first Nasco engine might have been QL1001, followed by NP1002, NT1001, 308N1004 etc. Once Nx9999 was reached the next number was Nx10000.

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