Turbo Rebuild Pg03

I found that the shaft had actually been rubbing on the cup even though the ring was in place. The exhaust turbine itself had also been rubbing on the cup on the back face.
TRICK FOR YOUNG PLAYERS #2 – The ring groove could have a build up of carbon in it. This will need cleaning out as any step or heavy scoring in this groove will mean it will still leak. If it’s a permanent step in the groove or other damage then its time to order another shaft. Mine was ok but caked with carbon, so I spun it up in my model lathe to clear it out.

There are a few things to note on the new parts. (rebuild kit not shown) The new centre housing has no provision for the lock tabs that are provided to affix the backing plate. The cooling fins that are on the new version foul the loc tab locations. You’ll see what I mean soon enough.

Carefully insert the two inner circlips and be sure to check they’re properly
seated in their grooves. Then after applying a light film of oil guide the bearings
into place and lock in by inserting the outer circlips. The thrust bearing and thrust collar shown are pretty obvious items. The journaled side sits against the centre housing with the pins locating it in place. The open section faces down.
TRICK FOR YOUNG PLAYERS #3 – The thrust collar goes chamfered side inwards (ie other way round on this pic) If not later on when you tighten up it will bind the turbo up.

The carbon seal goes in quite easily using a nice drift to avoid any damage to the seal. You will notice it springs in but don’t be silly enough to just hammer away. Find something that will only hit the outer edges – like a socket for example. The spring will have taken a bent shape slightly but that’s ok. The new one will do the same as soon as its inserted too.
TRICK FOR YOUNG PLAYERS #3 – one spring will hold normal use up to approx 15psi By adding another spring it increases to 18psi. This came recommended by Garrett and is shown in pics on the next page. Don’t be fooled though, 3 is not a better idea…..