Lynx II, hull # 4225

[Andrew Rowe]

Lynx used the single crankshaft pulley to serial #3000 and after that went to the double crankshaft pulley. I think the fan extension on the single pulley was used in some 1941 trucks as well , so was a common part that was adapted , not so sure about the double pulley , I think that was specific to the Mk2 Lynx .Cheers Andrew

[Lynn Eades]

Is anyone sitting on an engine build spec that covers the Lynx?

[Peter Duggan]

Guys,

I continue to be amazed at the level of knowledge and willingness to share with MLU members.

I'm now convinced that the issue rests with the water pumps. The parts manual for the Lynx calls for C29SR 8505 and 8506 for the pump housings. My LH pump housing has the number 79 8505.

I think the most unobtrusive way of correcting the alignment is to add a 5/8" spacer to the inside of the pulleys themselves. I will confer with my local machinist as to the practicality of this idea. Any suggestions or comments would be welcome.

I have yet to find any differences between the engine blocks themselves.

Peter

2017-01-07 16.34.47 (2).jpg

2017-01-07 16.35.02 (2).jpg

[David Herbert]

Originally Posted by Peter Duggan

.....I'm now convinced that the issue rests with the water pumps......I think the most unobtrusive way of correcting the alignment is to add a 5/8" spacer to the inside of the pulleys themselves......
Peter

The pulleys are just pressed onto the shafts, you just need the correct pulleys. T16 ones would be very close if they are not the exact ones you need. There would be little scope for fitting spacers as the pulleys are not pressed on untill they hit a sholder but untill they are flush with the outer end off the shaft. This means that you have some latitude to use the wrong pulley by not pushing it all the way on but you can not press it more than intended because it will hit the end of the pump housing.

David

[Mike Cecil]

Hi Rick,

I have only a workshop manual and stowage diagram for the Lynx 3 & 3*, so I'm simply amazed that the Lynx parts list you have does not contain the prefix and/or suffix for each part listed in the parts tables - every Ford parts list I have, from the GP to Master Parts Lists of various dates, lists the full spec in the tables (but not on the diagrams), hence my assumption that the Lynx list would be the same.

Just goes to show there is always something new to learn!

Mike

[Mike Cecil]

Hi Peter,

79-8505 is listed as a 'Housing Water Pump, Right Hand', for the V8 fitted to a 1.5 ton COE chassis with cab over engine cab. The 1944 master parts List shows that this is the part's only application for vehicles supplied to US Forces (it may have other applications). 79-8506 is the 'Housing, Water Pump, Left Hand' for the same application.

The pulley that was fitted to those pumps was the 79-8509B. Again, that was that pulley's only application.

You probably have one of the few V8 water pump housings that was shorter in depth than the usual - maybe look at a couple of pumps from a CMP and see if they are a deeper casting and will line up OK.

Mike

[Lynn Eades]

Going back,
I have looked and there does not seem to be room to manoeuvre on the bottom pulley.
The crank dimensions have generally been (in relation to this problem) the same since 1939
The bottom gear (6306) has had a 48 prefix across all models (it seems) of all relevant Ford V8s up until the reverse cut gear of the 8BA, (in the fifties)
So, to me it's like this:
Front of crank, the gear goes on, the slinger goes on, timing cover on,the pulley slides home.
There's not much you can get wrong in that.(is there?)

I'd like to know why the sheaves of the Lynx are set out further than a std pulley. Of course there will be a reason, but I can't figure it out.
I have a motor with the same timing cover. It has a std two sheave pulley on it.
Is it about the belts clearing that Dizzy box?

Anyhow it seems the answer lies in the pulleys and pumps as deduced.

To add to Mike's effort, the 78C number prefix refers to the bush type (single sheave) pumps and the 79C, refers to the twin sheave bearing pump housings.
For H.Ford to come up with a different part number (C29SR- 8505 and 8506) means those housings were special. Theat may not mean that they wont fit, It might be say, just a better water flow (if you are lucky )
Maybe David H. has hit on the answer? ... and it can be fixed with T16 pulleys? (remember though the part that changed was the housing)

[lynx42]

Originally Posted by Mike Cecil

Hi Rick,

I have only a workshop manual and stowage diagram for the Lynx 3 & 3*, so I'm simply amazed that the Lynx parts list you have does not contain the prefix and/or suffix for each part listed in the parts tables - every Ford parts list I have, from the GP to Master Parts Lists of various dates, lists the full spec in the tables (but not on the diagrams), hence my assumption that the Lynx list would be the same.

Just goes to show there is always something new to learn!

Mike

Well you will have to unlearn that fact Mike, as I only looked at the diagram and not the numbers page. The prefix is 78C before the diagram part number. So 78C 8509 for the pully and 78C 8504 for the LHS and 78C 8503 for the RHS pump.

img016.jpg img017.jpg

Is the stowage diagram a separate folded sheet, Mike? If so is there a chance of a copy, please. I do have a couple of pages S16 and S17 which show where things go but not a separate sheet.

Regards Rick.

[Mike Cecil]

OK: now it makes sense.

The stowage diagram is a single large sheet: much too big for my little scanner, though.

Mike