[Tigers] Mechanical clatter- Sat PM Test (James Lindner)

[Bill Waite]

Looks like you found the problem and know you need to replace the fan.
Just in case someone has a similar loud "click/click/click" on start up with a new fan, this was my experience.  When I installed the rebuilt engine (with a flex fan for the first time) in my Tiger, it made contact (slight) steering rack under the fan.  My fix was easy: I inserted 1/8" thick washers above both of my engine mounts (one at each mounting bolt).  That raised the engine enough to miss the steering rack tube.
Bill  

      From: "tigers-request at autox.team.net" <tigers-request at autox.team.net>
 To: tigers at autox.team.net 
 Sent: Saturday, October 21, 2017 4:39 PM
 Subject: Tigers Digest, Vol 9, Issue 281
   
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Today's Topics:

  1. Re: Mechanical clatter- Sat PM Test (James Lindner)
Hello All
 IT IS THE FAN. Another local tiger guy came by to put another set of eyes and ears on the problem. Sure enough, with the fan running, he detected some wobble/vibration in one of the blades. We removed the fan for a closer inspection. Sure enough one of the blades had a longitudinal crack in the aluminum blade running right along where it is riveted to the hub. The crack ran 3/4 of the way from the base of the blade to the end...probably getting close to total failure.
So now time for a new fan. Attached is a photo of the current fan. It is a 13 inch, 7 blade flex fan. Center hole is 5/8”


Any recommendations on replacement options. The current fan fit easily, allowed for plenty of clearance and did its job. Is there a better option? 
Thanks for all the help.
Jim

Sent from my iPad
On Oct 20, 2017, at 12:03 PM, Jay Laifman <jay.laifman at gmail.com> wrote:


I'm still voting for the fan.  Especially since it looks you have a flex fan and the sound  goes away at higher rpm.   Have you watched the rear of the fan blades and all edges of the fan all the way around and there is nothing even remotely close?  
I don't recall the Tiger generator very well.  Does it have a fan on the back of the pulley?  It could be that the bearing is worn enough that when there is tension of a belt on the pulley, it pulls the generator pulley and its little fan over just enough of motion that it is touching the face of the generator body or a screw that sits up a bit.
On Fri, Oct 20, 2017 at 7:49 AM, James Lindner via Tigers <tigers at autox.team.net> wrote:

Good Morning Listers

Thanks for all the input. This morning I removed the fan belt...and voila...the noise disappeared. Video with sound is below. I had a before video also but it made the email too large.






I made a checklist of yesterday’s input and here are the results:

Pulley hubs: All secure, no wobble
Spin fan & gen: No odd sounds...no contact with anything.
Dipstick: Straight
Fan & individual blades: Secure

Water level: Perfect
Gas: Shell 93 octane...always.

So what do you think. The fan is not hitting anywhere. With the fanbelt off the timing chain would continue to run...but no noise. I think those results rule our fan contact and stretched timing chain.

That leaves me with failing water pump. Although I am still a bit concerned that I did not hear any noisy bearings when I spun the fan or listened at the pump cover with the stethoscope.

Your thoughts/ideas please.

Thanks

Jim


Sent from my iPad
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