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‘Chirping’ sound from heat exchangers !


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This is driving me mad 😩...any known quick fixes other than turning the radio up ?

Had it down to 9E this morning for tracking adjustments and whilst up in the air , thought I’d have a look. The chirping noise only comes in at 1400 rpm through to 1800 then disappears. The stainless exchangers ( SSi ) are not as tighter fit as I thought they would be. Is there some heat proof lubricant or similar that I could squirt around all 6 tubes ??

Cheers in advance.

Nick. 

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