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Old 02-08-2004, 17:15   #1 (permalink)
jud
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tapping noise in 302 xc

My xc 302 ( only 85,000km-picked it up of an old grandpa) has started to make a tapping noise. When i went up in the black spur(mountains) it seemed to disappear, but soon came back. When i changed the oil i put in 20w-70 as I heard it was good for older engines, but i think the tapping has come since then. Does it make much difference if i use 20w-50 or 20w-70 on a car with only 85000. the engine is stock and runs great. Should I just change the tappets? Any advice would be great
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Old 02-08-2004, 18:32   #2 (permalink)
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Re: tapping noise in 302 xc

Bet it's a sticky lifter, can happen when you do an oil change. I'm sure it will free up over time if you keep up with oil changes. If it's only a slight ticking I wouldn't worry, if it gets louder then maybe pull out the lifters and replace them - they're cheap. 20W-70 a bit too heavy in my view for a motor that is not worn and only getting light duty.
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Old 02-08-2004, 19:07   #3 (permalink)
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Re: tapping noise in 302 xc

Would thicker oil (20w-70) cause the tapping?
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Old 02-08-2004, 20:15   #4 (permalink)
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Re: tapping noise in 302 xc

It could, might be too thick to get inside the lifters. Where does the tapping come from? 1 to 4 or 5-8 side of the engine? If it doesn't stop in the next 100km's change the oil to 20W 50 as thats what it prolly had before you changed it.

Failing that take the rocker covers off and look for any loose rockers or excessive clearance between rocker and valve tip.

The other tapping is usually a loose exhaust manifold, causing a ticking sound.

Have you revved the piss out of it at any stage? Whats the max you rev to?
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Old 02-08-2004, 23:46   #5 (permalink)
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Re: tapping noise in 302 xc

i use penrite hpr 30 dude and it is the best oil u can use on these old gurls id give penrite 30 a try

or it could be ur tappers to gona old
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Old 02-09-2004, 03:56   #6 (permalink)
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Re: tapping noise in 302 xc

Quote:
Originally Posted by jud
My xc 302 has started to make a tapping noise.
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Old 02-14-2004, 17:22   #7 (permalink)
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Read Re: tapping noise in 302 xc

Guys...a quick lesson in oils!

20W-50 and 20W-70 is the same viscosity.

All oils have the viscosity (thickness) in the first number eg 20W
The second number is the temperature that the oil is rated in loaded conditions. Therefore if your towing alot (horse floats, boats) then 20w-70 would be better than 20w-50.

Also if you look on the back of most oils, there will be an API standard followed by eg. SL/CF. The first letters give you the quality of the oil. The second set of letters are the diesel ratings. The higher the prefix eg 'SL' then the better the oil quality. These days SL is the highest rating. Cheaper oils have prefix SG or SF. You will find Shell, Penrite, Castrol and Pennzoil to be the better brands or the unknown French oil Motul which is awesome.

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Old 02-16-2004, 15:27   #8 (permalink)
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Re: tapping noise in 302 xc

FYI- just a link to some oil info, and a snippet...

http://www.corax.org/hotwater/oil/Oil-3.html

<<<Base stocks can be classified in any of eight viscosities ranging from SAE 5W (low) to SAE 50 (high) The W after the number, as in SAE 5W, SAE 10W, SAE 15W, and SAE 20W, means the oil is rated for flow at 0 degrees F (for winter use). Without the W, as in SAE 20, SAE 30, SAE 40, and SAE 50, the ratings are measured at 210 degrees F. Multi-viscosity oils, which are denoted by SAE ratings such as SAE 20W50, have been compounded to act like a 20W oil at 0 degrees F and like a 50 weight oil at 210 degrees F.>>>
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