SS Jaguar 100
|Restoration Log by Dan Mooney
Update report -
July 11, 2017
The finished article - a set of custom forged SS100 pistons.
The following sequence of photographs show the new one piece rear crankshaft seal that Corey designed and fabricated, and the process of creating a piston mold from which we will manufacture a set of custom forged pistons for the SS100 engine.
|New uprated one piece rear crank seal
||Piston mold allows us to optimize the
the forged pistons we will make for this engine
Huge thanks to Alan Gibbins of SS Spares in the UK who time and again has come up trumps when we have needed rare and obsolete parts for our SS100 restoration. Alan has also been kind enough to share his encyclopedic knowledge of the SS100 with me, which is very much appreciated!
One of our challenges with this particular engine rebuild is taking ancient old bearings and machining them to a specific 'eccentric' shape. This is not something typically discussed in modern engine building, although in vintage engine building it is sometimes necessary to take an oversized bearing and bore it until you have the desired clearance. This is a tricky enough operation to begin with, made even more so because the bearing surface itself has to be eccentric (not cylindrical). Half shell rod and main bearings do not have a wall of uniform thickness. The wall is thickest at the point of the split and tapers off a prescribed amount towards each parting line. This taper, or drop off, is called eccentricity. Eccentricity in the SS engine application is designed to promote oil film formation by creating a wedge shape in the bearing clearance space. In these circumstances, bearing clearances must be measured at 90 degrees to the split line.
I have included a short video clip below demonstrating how Kevin machined the bearings within the rod housing.
|Alan Gibbins at SS Spares in England came
with these ancient NOS bearings
|Non-destructive testing of rod bolts
|Checking rods for straightness
|Grinding rod caps square
|Identifying bearing center line
||Click on the thumbnail to view a short
of the process
|Setting up to surface cylinder block
Corey has been busy in the CJ engine shop machining your cylinder head back to pristine condition.
|Intake and exhaust flanges surfaced on the
|Surfacing the cylinder head deck surface
||Deck surface and chambers literally as new
||Checking original alloy rods for
Align honing the block, designing a one piece rear crank seal, damaged valve cover and oil filter housing...
|Grinding main caps square
|Align honing in progress
|Unusual looking cooling fan
||Oil filter housing is damaged
|Note damaged lip on filter housing
||Water pump will be rebuilt
|We have decided to fabricate an upgraded
piece rear seal
|Plotting out center lines for new one piece
rear seal upgrade
|To be continued...
|Kevin's notes having measured the camshaft
|Unfortunately the valve cover is damaged
|A replacement valve cover will be required
||Original alloy rods will be rebuilt
Taking a closer look at the crank, rods and main bearings.
|Magnaflux checking the block for cracks
||Time to take a closer look at the crank
|Part number 43055
||Main bearings look to be in exceptional
at first glance
|Main bearing part number
|Various stampings on the rods
||Alloy rod part number
Engine tear down, continued....
|Cam chain and sprocket
|Missing rod cap
|Oil pan baffle
|Rear seal housing
|Crankshaft journals all standard
|Pistons are also standard
|Interesting oil feed system on alloy rods
||Separating piston from rod in order to
|Cylinder head tear down underway
||Measuring stem height
|To be continued...
Almost time to get a much needed engine rebuild underway!
Examining the tool roll in detail: I believe the canvas roll itself is from a very early XK120, as are most of the tools. Unfortunately, I don't think any of the tools were originally supplied with our SS100.
As delivered, late on Wednesday evening
Lowering the engine into position
Cylinder head and carbs installed
Original oil pan and radiator
Slimline chassis looks to be in great shape
Original SS spinner holding the spare wheel
Original generator, water pump and oil filter housing
Note July 1937 date on the generator plaque
One of the most beautiful and recognizable
grills in the automotive world
A very full looking tool roll
Original top and side screens
Car looks rather better with the top and screen folded!
Original SS gauges
Glovers of Ripon apparently sold 49050 when new
The ceramic Glovers of Rip badge was attached
in the center of the dash
Original data plate
RAC badge was installed on the left side of the dash
Starting to look more like a car
We look forward to getting the restoration of this very
special car underway some time in the future!