Oetiker clamp Guide for P80 Volvos

MVS Contributor FireFox31 puts together a wonderful guide to Oetiker clamps… what sizes you need for what job and where to get them.

FireFox31 » Oetiker clamps used on a 2000 V70 NA automatic:

Axle boots – Front right:
Outer boot large = Oetiker 925 with 10 mm band (may not be OEM)
Outer boot small = Oetiker 310 with 10 mm band (may not be OEM)
Inner boot large = Oetiker 895 with 7 mm band
Inner boot small = Oetiker 34 with 7 mm band

Cooling:
Upper and lower hose x4 – 988030 – Norma Torro 32-50 mm worm clamp with 9 mm band
Coolant tank bottom hose x2 – 989879 (988024) – Norma Torro 16-27 mm with 9mm band
Coolant tank top hose x2 – 976577 – Screw clamp. Mine was a CLIC 66 before I replaced it.

PCV:
Oil trap short hose to upper engine port x2 – 978180 (not 976584) – Oetiker 346
Oil trap top hose to engine top x2 – 976561 – Oetiker 256
Oil trap top hose to and air intake – 976561 – Oetiker 256

Power steering:
PS fluid tank bottom hose – 976561 – Oetiker 256
Inner tie rod boot large for SMI rack –
Inner tie rod boot small for SMI rack –

The Oetiker clamps which appear on many Volvo components are likely Oetiker StepLess Ear Clamps in 167 stainless. A complete list of sizes is available in their product catalog, starting on page 35. I’ve come to this conclusion based on the ear and interlock design as shown in the attached picture.

Wait, What Are Oetiker Clamps Anyway?

The clamp is a metal band with a protruding “ear,” the sides of which are forced together to tighten the ring around a hose. The metal band is fitted around the hose which is to be connected.

Once the clamp is on, the hose goes over the pipe or pipe fitting. The inside diameter of the hose should be close to the outside diameter of the pipe to ensure a snug fit and that there are no gaps once the clamp is secured.

The ear clamp is tightened around the attached hose by specialized pincers, which force the sides in on themselves. The pincers come in a standard style which closes the clamp while being held parallel to the ear and a “side jaw” style which closes from a perpendicular position. The side jaw pincers are used for tight spaces, where it is difficult to reach with standard pincers. It is important to only crimp the oetiker clamps with a single tool stroke. Applying a second layer of force can damage the clamp.

https://www.directmaterial.com/what-are-oetiker-clamps-how-are-they-used