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Discussion Starter #1
is there any type of flush that can be got to fluch out a gearbox, i know it is possible to get engine flush and rad flush..is there a gearbox flush
 

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Unlike an engine, a mass production gearbox usually has no oil pump or small pressurised oil galleries and relies almost solely on splash lubrication to oil everything. Engine and rad flushes are designed to breakdown deposits which can block the narrow passages in each. If a gear or syncro has shattered the box usually has to come apart to replace the part anyway and in the process can be cleaned. If the oil has become contaminated with water it can be drained, refilled with cheap semi-synthetic engine oil and driven for a short while and then drained and refilled with decent gearbox oil. While you'r draining the oil make sure the bung fitted to the gearbox is the magnetic type to catch any future floating debris, if it's not a quick trip to the local scrap yard will find a cheap replacement of the same tread which is magnetic.
Why do you want to flush the gearbox?
 

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Discussion Starter #5
Originally posted by x-works
Unlike an engine, a mass production gearbox usually has no oil pump or small pressurised oil galleries and relies almost solely on splash lubrication to oil everything. Engine and rad flushes are designed to breakdown deposits which can block the narrow passages in each. If a gear or syncro has shattered the box usually has to come apart to replace the part anyway and in the process can be cleaned. If the oil has become contaminated with water it can be drained, refilled with cheap semi-synthetic engine oil and driven for a short while and then drained and refilled with decent gearbox oil. While you'r draining the oil make sure the bung fitted to the gearbox is the magnetic type to catch any future floating debris, if it's not a quick trip to the local scrap yard will find a cheap replacement of the same tread which is magnetic.
Why do you want to flush the gearbox?
i was using a maxol semi syntecic gear oil but was told to use the silkolene syn5 gear oil, only thing the maxol is a red colour oil and the syn 5 is a brown colour and am wondering is it ok to mix the oils even tho i will be draining to old oil out im still cautious that some oil maybe still in the box
 

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get the car well up to working temperature and the box nice and warm so you can't leave you'r hand on it, then drop the drain bung and walk away for 30 minutes, whatever oil left after that will not contaminate the new stuff both are syntecic's.
 
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