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Engine is making a loud rattling/scratching sound

Tiny
TEVINN
  • MEMBER
  • 1979 FORD RANCHERO
  • 88,000 MILES
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.
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Tuesday, April 24th, 2012 AT 10:32 PM

2 Replies

Tiny
HMAC300
  • 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.
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Tuesday, April 24th, 2012 AT 10:43 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 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
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Wednesday, April 25th, 2012 AT 12:41 AM

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