Funny Sawblade Sound.....

[wheezy]

Hello, I bought an 85 FJ60 not too long ago, and my first time out on the trail, the cruiser ran like a champ. Then, about halfway out on the trip, I started to hear a funny noise....let me try and explain it. Right now, it happens under high RPM's in Low Range, and is associated with the engine and tranny ( I can make the sound when I'm not moving, but revving up the engine in gear, like, say, when I'm trying to climb over something but haven't started moving yet). So, it's not driveshaft/axle related. Best way to describe the sound is when the engine is revving down, it sounds like a table saw blade slowing down.......

Good luck on understanding me....

 

[dogboy2]

does this only happen when the transfer case is engaged in 4 wheel drive or in 2 WD as well?

can you elaborate?

-db-

 

[Cruisergreg]

Check for a bad engine mount, which can allow the fan to jump into the shroud under the conditions you describe.

 

[cruiserdan]

I second Greg's observation, possible LH engine mount broken. If memory serves Greg had a broken mount at one time.

 

[wheezy]

That engine mount idea is making sense, before the water pump went out, the sound happened quite easily. It happens mostly when the engine is heavily accelerated, ie - under torque stress when climbing. However, it does do it in 2WD on the road if I try to accelerate quickly. It seems like the engine mount would be it as the torque would move the engine enough for the fan to hit the shroud. I'll have to bend the shroud around, or maybe remove it? Would that make the engine run hotter?

 

[green40]

Fix the mount! They aren't that expensive, under $30!
Green40

 

[60wag]

Leave the shroud alone and fix the mount. You can probably see some minor damage to the ends of the fan blades if they have been rubbing the shroud.

 

[wheezy]

There is actually a lot of damage to the fan, ie chunks are missing! Those happened from hitting on the AC Compressor. I think because of that, it caused extra stress on the water pump bearing, thus causing that to go too. I just discovered another post on this same topic, so it seems that motor mounts are popular fixes on these 60's.