John Deere約翰迪爾強(qiáng)鹿柴油機(jī)曲軸箱廢氣過(guò)大的檢查方法

Excessive blow-by coming out of the crankcase breather

tube (A) indicates that either the turbocharger (if

equipped) seals are faulty or the piston rings and cylinder

liners are not adequately sealing off the combustion

chamber. This is a comparative check that requires some

experience to determine when blow-by is excessive.

Run engine at high idle and check crankcase breather

tube. Look for significant fumes and/or dripping oil coming

out of the breather tube at fast idle, with no load.

If excessive blow-by is observed, perform the following to

determine if the turbocharger (if equipped) is causing the

blow-by:

1. Remove the turbocharger oil drain line where it

connects to the engine block and run line into a

bucket.

2. Run engine at high idle, slightly loaded, and determine

if boost pressure is forcing oil through the drain line.

Check crankcase breather tube to determine if blow-by

has decreased.

3. If it appears that boost pressure is forcing oil through

the drain line, and/or blow-by decreases with the drain

line disconnected from block, replace the turbocharger,

and retest.