Volumex supercharger overhaul - rebuild

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Guy Croft
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Volumex supercharger overhaul - rebuild

Post by Guy Croft »

Showing steps in the rebuild of the low pressure supercharger used on the Lancia Volumex (Vx) unit. (The 'MM' prefix with the photos is the client's initials)
Attachments
Rotors, main casing and front, rear housings after decarbonising, dressing and beadblasting, ready for Xylan coating.
Rotors, main casing and front, rear housings after decarbonising, dressing and beadblasting, ready for Xylan coating.
MM Vx parts cleaned.jpg (108.13 KiB) Viewed 31120 times
Internal parts pre-cleaned, gears, thrust washers, nuts etc
Internal parts pre-cleaned, gears, thrust washers, nuts etc
a 058.jpg (115.66 KiB) Viewed 31103 times
End covers and rotors coated with Xylan 1010 conductive polymer, this gives lower friction, quieter running and reduced clearances/better performance and less power loss.
End covers and rotors coated with Xylan 1010 conductive polymer, this gives lower friction, quieter running and reduced clearances/better performance and less power loss.
a 062.jpg (111.85 KiB) Viewed 31080 times
New rear seals oiled lightly on outer diameter and ...
New rear seals oiled lightly on outer diameter and ...
a 064.jpg (118.08 KiB) Viewed 31075 times
...gently pushed into place by hand using a special drift, they must sit square and sit right in their machined recess.
...gently pushed into place by hand using a special drift, they must sit square and sit right in their machined recess.
a 065.jpg (117.66 KiB) Viewed 31051 times
..whereas the front seals need a bit of help from the press after initial location by hand, again oiled on OD or they will never go in properly and likely end up torn (and leaky)
..whereas the front seals need a bit of help from the press after initial location by hand, again oiled on OD or they will never go in properly and likely end up torn (and leaky)
a 066.jpg (114.4 KiB) Viewed 31038 times
A press, and modest pressure with a decent mandrel needed to seat the front seals.
A press, and modest pressure with a decent mandrel needed to seat the front seals.
a 067.jpg (115.97 KiB) Viewed 31017 times
Remove the inner sleeve and oil the OD of the rear bearings and press in gently down to their seat, nice and square.
Remove the inner sleeve and oil the OD of the rear bearings and press in gently down to their seat, nice and square.
a 068.jpg (107.88 KiB) Viewed 31009 times
Rear bearings fitted, sleeves refitted, they should turn freely if the brgs are fitted properly. I like to have the number code facing out so you can see what's in there..
Rear bearings fitted, sleeves refitted, they should turn freely if the brgs are fitted properly. I like to have the number code facing out so you can see what's in there..
a 069.jpg (119.63 KiB) Viewed 30996 times
Here is the front bearing, an SKF four-point contact type that I have had precision-reworked to 'C2' close axial tolerance. Position one inner sleeve in the front casing and ...
Here is the front bearing, an SKF four-point contact type that I have had precision-reworked to 'C2' close axial tolerance. Position one inner sleeve in the front casing and ...
MM_01 Vx rebuild 001.jpg (117.74 KiB) Viewed 30976 times
One front bearing pressed into place
One front bearing pressed into place
MM_01 Vx rebuild 003.jpg (115.58 KiB) Viewed 30964 times
With both bearings fitted and their outer sleeves installed the bearing retaining plate can be fitted, fit new spring washers and tighten the M6 nuts to 8lbf ft.
With both bearings fitted and their outer sleeves installed the bearing retaining plate can be fitted, fit new spring washers and tighten the M6 nuts to 8lbf ft.
MM_01 Vx rebuild 007.jpg (116.82 KiB) Viewed 30958 times
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