Volumex supercharger overhaul - rebuild

Supercharging, turbocharging, charge cooling
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Guy Croft
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Volumex supercharger overhaul - rebuild

Post by Guy Croft » September 2nd, 2006, 4:36 pm

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
MM Vx parts cleaned.jpg
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 11801 times
a 058.jpg
Internal parts pre-cleaned, gears, thrust washers, nuts etc
a 058.jpg (115.66 KiB) Viewed 11784 times
a 062.jpg
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 11761 times
a 064.jpg
New rear seals oiled lightly on outer diameter and ...
a 064.jpg (118.08 KiB) Viewed 11756 times
a 065.jpg
...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 11732 times
a 066.jpg
..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 11719 times
a 067.jpg
A press, and modest pressure with a decent mandrel needed to seat the front seals.
a 067.jpg (115.97 KiB) Viewed 11698 times
a 068.jpg
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 11690 times
a 069.jpg
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 11677 times
MM_01 Vx rebuild 001.jpg
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 11657 times
MM_01 Vx rebuild 003.jpg
One front bearing pressed into place
MM_01 Vx rebuild 003.jpg (115.58 KiB) Viewed 11645 times
MM_01 Vx rebuild 007.jpg
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 11639 times

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