sim303
Active Member
- Joined
- Jan 31, 2017
- Messages
- 63
- Country Flag
Hi
My Cruiser makes a disinct clonk when coming on and off the throttle. It's not grossly offensive, but does detract from the ride. I had a quick look in to it a few years ago (thread here: Driveline Clonk (rear diff?) - [Leaving Land Cruiser Club]). I later found that the front hub splines were badly worn and replacing these certainly helped a bit. However it didn't eliminate the problem. So, as things like this have the potential to get expensive quickly, I am keen to isolate the culprit as best I can before replacing more parts.
Today, I went for a test drive to try to identify the specific conditions that give rise to the clonk. I wanted to check whether it was specific to a certain gear etc, so went through various steps, disabling O/D, limiting the gearshift to "2", driving fast and slow etc. The clonk occurs regardless, when the load comes on and off the drivetrain.
Now for the more interesting discovery.... I found that if I engage the centre diff lock, the problem goes away! It's so smooth! I'm sure that's how it is supposed to be!
So, what does this finding tell me? To my thinking, one of the following:
I wonder if this sounds like a reasonable next line of investigation...
(From memory I think it is the rear that showed the most slop when turning its prop by hand in neutral, but I'd need to get under there and check again.)
Cheers
PS I should add, all the grease points were pumped full to no great effect
My Cruiser makes a disinct clonk when coming on and off the throttle. It's not grossly offensive, but does detract from the ride. I had a quick look in to it a few years ago (thread here: Driveline Clonk (rear diff?) - [Leaving Land Cruiser Club]). I later found that the front hub splines were badly worn and replacing these certainly helped a bit. However it didn't eliminate the problem. So, as things like this have the potential to get expensive quickly, I am keen to isolate the culprit as best I can before replacing more parts.
Today, I went for a test drive to try to identify the specific conditions that give rise to the clonk. I wanted to check whether it was specific to a certain gear etc, so went through various steps, disabling O/D, limiting the gearshift to "2", driving fast and slow etc. The clonk occurs regardless, when the load comes on and off the drivetrain.
Now for the more interesting discovery.... I found that if I engage the centre diff lock, the problem goes away! It's so smooth! I'm sure that's how it is supposed to be!
So, what does this finding tell me? To my thinking, one of the following:
- There's excessive lash in the centre diff itself which gets locked out by engaging the diff lock
- There's excessive lash in either the front drive train OR the rear drive train, but not both. By locking the two props together, the good one inhibits the bad one from slopping back and forth as the power is transmitted through the locked centre diff.
I wonder if this sounds like a reasonable next line of investigation...
(From memory I think it is the rear that showed the most slop when turning its prop by hand in neutral, but I'd need to get under there and check again.)
Cheers
PS I should add, all the grease points were pumped full to no great effect