EXPERTS please chime in: how much to torque hose clamps?
#1
Burning Brakes
Thread Starter
EXPERTS please chime in: how much to torque hose clamps?
I'm buttoning up my intake and coolant hoses.
How much should I torque the worm-drive hose clamps? I don't want to tighten too little and allow a leak, but not too tight and risk ripping something.
Searching the internet, I've found disparate responses:
a) "7 lb-ft."
b) "22 inch-pounds"
c) "Tighten until the clamp does not move, then add two turns."
What do the experts say?
How much should I torque the worm-drive hose clamps? I don't want to tighten too little and allow a leak, but not too tight and risk ripping something.
Searching the internet, I've found disparate responses:
a) "7 lb-ft."
b) "22 inch-pounds"
c) "Tighten until the clamp does not move, then add two turns."
What do the experts say?
#2
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Much depends on how old are the hoses and what type and how old the hose clamps. But remember coolant system pressure is limited by the radiator cap to ONLY about 14 psi... it really should not take much
#3
Nordschleife Master
Experts?
It's surprising that there aren't clearer specs on this. The answer will vary depending on what type of hose and clamp are being used.
A problem is that over-tightening the clamp will damage the hose or the clamp. But you don't want a leak. What side to err on? I tighten as tight as I can using a screwdriver or nut driver. A wrench gives a lot more leverage and makes it easy to be too tight. I go easy if using a wrench, or socket wrench, and would think the toque is about 2 ft lbs. So I'll go with answer "b."
A related note is that Porsche always uses good hose clamps with rolled edges and raised threads. Some go down to a fixed size and eliminate the question of what toque entirely; just make them close.
It's surprising that there aren't clearer specs on this. The answer will vary depending on what type of hose and clamp are being used.
A problem is that over-tightening the clamp will damage the hose or the clamp. But you don't want a leak. What side to err on? I tighten as tight as I can using a screwdriver or nut driver. A wrench gives a lot more leverage and makes it easy to be too tight. I go easy if using a wrench, or socket wrench, and would think the toque is about 2 ft lbs. So I'll go with answer "b."
A related note is that Porsche always uses good hose clamps with rolled edges and raised threads. Some go down to a fixed size and eliminate the question of what toque entirely; just make them close.
#4
Three Wheelin'
Lol, i like how you emphasize EXPERTS!! One thing to think about is getting those spring steel type that always apply the correct pressure (and a bitch to get off without hose clamp pliers). I'm sure Greg will correct us all here in a minute or two.
#5
Burning Brakes
Thread Starter
#7
Rennlist Member
Where do you buy quality hose clamps? I hate the cheap ones that break as soon as the slightest torque is applied. Grainger, Fastenal?? I have a box of good and bad that I've collected over the years--but I never know 'til I use it. I'd like to throw them all away and start over.
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#8
Three Wheelin'
I would imagine a good fastener place sells them, or a performance shop. Lol the buckwheat quote made me laugh, we had a co-op student at the dealership that we called Buckwheat. Dumber than a bag of hammers, useless kid.
#9
Nordschleife Master
#10
Rennlist Member
^^^^ Perfect, thank you! Just looked, also on Amazon
Edit: I also see on one of the e-bay ads "Original Equipment on Porsche, BMW, Audi, Land Rover, Jaguar, VW, Corvette and many others."
Edit: I also see on one of the e-bay ads "Original Equipment on Porsche, BMW, Audi, Land Rover, Jaguar, VW, Corvette and many others."
Last edited by NoVector; 11-17-2013 at 04:33 PM.
#11
Archive Gatekeeper
Rennlist Member
Rennlist Member
Interesting, the torque values are _really_ low.
From
https://www.belmetric.com/metric-cla...esrrcv4rl7tkh0
From
https://www.belmetric.com/metric-cla...esrrcv4rl7tkh0
Code:
Part # Range Width Torque Torque Torque (mm) (mm) in-lb Nm Ft lbs CR12 8-12 9 22 2.5 1.83 CR12N 8-12 7.5 17.7 2 1.48 CR16 8-16 9 22 2.5 1.83 CR16N 8-16 7.5 17.7 2 1.48 CR20 12-20 9 26.5 3 2.21 CR22 12-22 9 26.5 3 2.21 CR27 16-27 9 26.5 3 2.21 CR32 20-32 9 26.5 3 2.21 CR40 25-40 9 26.5 3 2.21 CR40W 25-40 12 26.5 3 2.21 CR45 30-45 9 26.5 3 2.21 CR50 32-50 9 26.5 3 2.21 CR60 40-60 9 26.5 3 2.21 CR70 50-70 9 26.5 3 2.21 CR80 60-80 9 26.5 3 2.21 CR90 70-90 9 26.5 3 2.21 CR100 80-100 9 26.5 3 2.21 CR110 90-110 9 26.5 3 2.21 CR120 100-120 9 26.5 3 2.21 CR130 110-130 9 26.5 3 2.21
#14
Burning Brakes
Thread Starter
Interesting, the torque values are _really_ low.
From
https://www.belmetric.com/metric-cla...esrrcv4rl7tkh0
From
https://www.belmetric.com/metric-cla...esrrcv4rl7tkh0
Code:
Part # Range Width Torque Torque Torque (mm) (mm) in-lb Nm Ft lbs CR12 8-12 9 22 2.5 1.83 CR12N 8-12 7.5 17.7 2 1.48 CR16 8-16 9 22 2.5 1.83 CR16N 8-16 7.5 17.7 2 1.48 CR20 12-20 9 26.5 3 2.21 CR22 12-22 9 26.5 3 2.21 CR27 16-27 9 26.5 3 2.21 CR32 20-32 9 26.5 3 2.21 CR40 25-40 9 26.5 3 2.21 CR40W 25-40 12 26.5 3 2.21 CR45 30-45 9 26.5 3 2.21 CR50 32-50 9 26.5 3 2.21 CR60 40-60 9 26.5 3 2.21 CR70 50-70 9 26.5 3 2.21 CR80 60-80 9 26.5 3 2.21 CR90 70-90 9 26.5 3 2.21 CR100 80-100 9 26.5 3 2.21 CR110 90-110 9 26.5 3 2.21 CR120 100-120 9 26.5 3 2.21 CR130 110-130 9 26.5 3 2.21