engine is making a loud rattling/scratching sound

1979 FORD RANCHERO
88,000 MILES
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TEVINN
  • MEMBER
  • 1 POST
I have a 1979 ford ranchero. my engine is making a loud rattling/scratching sound around the belts/fan area. What is it? It gets louder or rather more frequent when i accelerate, it sounds like something needs some WD-40 or like if a metal fan was scratching the metal.
Apr 24, 2012 at 3:32 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
first disconnect teh fan belt and start car to eliminate noise form accessories. then check the oil pressure, it may below an dyou have an internal problem.if pressure is good then try decarbonizer on it, follow instructions on can. ford or gm dealers have the same stuff.
Apr 24, 2012 at 3:43 PM
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CJ MEDEVAC
  • ✓Experienced Mechanic
  • 11,000 POSTS
MIGHT BE YOUR TIMING CHAIN SLACK

IF YOU'LL HOLD THE THROTTLE AT ABOUT 1500 RPM

THEN SUDDENLY LET OFF

AND THE RATTLE WORSENS FOR A SECOND OR SO

IT IS PROBABLY THE CHAIN

KEEP US INFORMED

THE MEDIC
Apr 24, 2012 at 5:41 PM
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