Breslau7
Samba Member
Joined: October 13, 2012
Photos: 150
Location: Lismore NSW Australia
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| Rebuilding a type 3 cooling fan |
Posted: Tue Apr 14, 2015 4:46 am Views: 155
Rating: Not rated
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I have replaced my cooling fan for the 3rd and last time.
It had started to hit the side of the aluminium housing and made the usual clattering noise.
Previously I tried 2 methods to fix the problem, both times they failed again within 10000 miles.
Method 1: using the bolt holes.
The bolt holes are no use for stopping play in the fan.
They are only used to pull the fan off.
Leaving them in will unbalance the fan and over time cause the crank to chew out the case.
Method 2: welding the fan
Welding the fan will remove the damping characteristics and also destroy the motor in time.
This time we turned up a mould (this pic) and poured new urethane damper rings.
To put it back together we used dual sided rivets machined from a clutch system and a special rivet tool @ 2.5 tonne pressure.
After that the fan was rebalanced to reduce vibration.
The result is the first new cooling fan for a type 3 in 20+ years.
Testing so far has amounted to 1000 miles with no issues. |
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