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Hey boys...been a long time since my last post....I hope all is well. I have a new problem I noticed today after I just had the oil changed in my 83 Jalpa. Before the change, I had a small, metallic tapping sound at idle that I believed to be normal valve noise. After I changed the oil, and filter today...I now have a knocking like sound that is somewhat irregular in nature that is really only noticable at idle. When we changed the oil, we started it with 9 quarts to build oil pressure and move the oil so we could add the other 3 quarts (12.3 to be exact) No leaks, but oil does seem to be a bit foamy (air in it). Did we screw something up?? The car seems to operate as before, and is running fine.

Any input would be appreciated.

FrankD
83 Jalpa
 

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Frank,

did you use the same oil as before?
Take car you use 10Wxx Oil, I even put 15W50 Mobil 1 in my engines.
The oil can be a little bit foamy when checked right after the running.

The oil has normally nothing to do with the valves but with pistons which have a tolerance, cold days and thinner oil will increase this tolerance which might lead to more noise.

BTW did you repaint your Jalpa, I have a picture in the registry when it was white.
 

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Raymond......great to hear from you...I hope all is well. The manual calls for 20w 50 as an alternative to the original oil from the factory. I'm not sure what was in it before since this is the first oil change I've done....and the dealer is not sure. The car was serviced by a lambo dealer in chicago before I bought it. Could this create a problem??

Thanks again

Frank
ps Car was always red...I'm on the registry now under my name.
 

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I am not sure Frank. Does it sound like it is coming from the top end, the bottom end, or the cam chains maybe?

My old one needed the cam chains adjusted as a start.
 

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Discussion Starter #5
Hey David...how are you. I'm having trouble isolating the origin of the noise. I'm going to run it over to my buddie to have a look. If I can't sort it out, I send it over to Wil Degroot at exotics.
Thanks for the reply
 

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Frank,
10W50 or 15W50 is fine, 20W50 is over the top IME.

If oil pressure is fine the bearings should be OK, then next thing could be the piston bolts, next the piston itself with too much tolerance and finally the timing chains could be too loose.
Was valve clearance checked once? Could also be too less valve clearance, leading to valves smashing onto their seats.
 

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Castrol GTX 20w~50w & Baldwin tractor Filter for me.
I tried Mobil1, started to drip everywhere :eek:

Anyway, When I did my bearings & oil pump rotors I had them all Vacuum Moly impregnated.
 

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Frank:

I think I know what noise you are talking about. Mine has done it since I got the car 2 years ago.

If you want to try an experiment that I did, it will dumbfound you even more....

Mine makes that same "knocking" sound. However, when I put an electrical load on it (such as turning on the headlights, turning on the fan, etc...) the knock goes away! This almost leads me to believe that it could be something to do with the shaft that runs the disrtributor and waterpump.

I still haven't isolated it, but it also doesn't seem to by causing any problems. My oil pressure is good too.

By the way, I use Mobil 1 10-50 in mine.

Mike
Jalpa #12071
 
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