This critical coolant hose hardly ever gets changed, and when it ruptures, you could experience a catastrophic engine failure. The chief reason is that it is almost impossible to see and inspect.
Product Details
It is located under the idle air valve. You can see the age even on this low mileage hose ( under 100K).
Related Products:
420SEL 560SEL 560SL 560SEC V-Belt and Fan Clutch Replacement Kit
Both items you see above with complete video instructions. Click on each product included for more info. There are other parts you may want to replace at the same time such as the water pump, thermostat, short hose, and radiator hoses at the same time. See related products below.
1986 to 1991 420 560 V8 Engine Water Pump
New water pump and gasket as shown. Plan to change the short hose and thermostat at the same time. Inspect v-belts and change if cracked.
1986 to 1991 420 560 V8 Engine Thermostat 80C
If your engine is taking too long to heat up or is constantly running "hot" it is probably time to replace the thermostat. Kent explains in the video below some other parts you should consider replacing at the same time.
1986 to 1991 420 560 V8 A/C Idler Pulley
The bearing in this pulley wears out at 80,000 to 120,000 miles and can cause rumbling sounds while the engine is running. A good time to plan to replace or at least inspect this is when you change the V-belts.
1986 to 1991 420SEL 560SL, 560SEL, 560SEC Fuel Injector Replacement Kit
PLEASE NOTE: Possible shipping delay. This is a special order item and may take up to 7 days before we can ship it!
How to Change 420 560 V/8 Engine V-belts
in this detailed 38-minute video Kent will walk you step-by-step through the procedures of removing the old belts, installing the new belts, and tightening them properly. When changing your V-belts there are other things you should consider replacing as well.
420 560 V8 Engine Drive Belt Replacement Kit w/ Video Instructions
If you have one belt that is going bad, replace them all simultaneously. You don't want to have to do this job again in the near future.
450 380 500 420 560 V8 Air Filter Housing Bottom Seal
This can replace that old, hardened, and worn-out seal at the bottom of your V8 air filter housing to prevent dirt and dust from entering your. Check yours soon to see how tight it fits on top of the fuel distributor.