Posted by Texasmark1 on January 08, 2013 at 08:19:03 from (198.45.243.137):
In Reply to: Cummins turbo's posted by jon f mn on January 08, 2013 at 05:14:52:
Having run an 800 cu in 400 HP big cam Cummins turbo for awhile, before you plunk down $700 or so in today's money, ensure that the turbo is in fact the problem......BTDT and not only did I pay for the turbo, plus installation, I lost a days work having something fixed that wasn't broken.
The turbo is nothing but a shaft on bearings with a fan on either end inside a housing....with an external source of oil . About the only thing that can go wrong is to throw a blade or have a bearing wear out; both of which can be checked without removing the unit. You can eyeball both ends and check the blades and spin the shaft with your finger and check for shaft wobble or worn out bearing noises/friction/roughness in the rotation.
If the output "circuit", the high pressure air inlet to the engine intake manifold, has ANY cracks or openings of any kind, the pressurized air will blow out through the opening and whistle. The configuration and size of the opening determines just what kind of noise it makes.
Take something like a small feather or anything that can detect air flow and go over all the piping joints and the manifold gaskets and see if you can find a leak. Or you might wait till the engine is cool and with a bottle of soapy water and the engine idling, run over the joints with that.
On my experience, after the fact the whistle was still there and I found a small pin hole in the pipe that was the cause. I can't recall what arrangement I made with the repair facility owing to the fact that since the turbo wasn't the problem they should have removed it and put mine back.
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