Why most of the new non-original compressor cylinder heads fail to work properly?

A considerable part of compressor failures can be traced down to issues inside the compressor cylinder head

The root cause is either a material quality, an assembly or a machining related issue. This time we look at the machining problems.

As we have figured out the problem in most cases relates to surface roughness. Checking of this is a simple, yet critical phase of the manufacturing process, that many of the producers fail to perform correctly. Compressors are a time-bomb on the vehicles. Sooner or later time is up, and problems come. 

Our internal policy addresses this problem effectively: all outsourced cylinder-heads go through a surface grinding process.
This is the great difference between us and spare part dealers that may buy from the same factory.

Typical compressor cylinder head applications are:

LK1300, LK1500, LK1503, LK1504, LK1511, LK1517, LK1518, LK1520, LK1521, LK1522, LK1524, LK1527, LK1532, LK1534, LK1545, LK1549, LK1550, LK1802, LK1808, LK1811, LK1813, LK1814, LK1900, LK1901, LK1998, LK3501, LK3509, LK3510, LK3515, LK3517, LK3802, LK3813, LK3826, LK3833, LK3840, LK3841, LK3859, LK3866, LK3869, LK3921, LK3927, LK3930, LK3941, LK3965, LK3966, LK3970, LK3980, LK3986, LK3994, LK4908, LK4909, LK4910, LK4911, LK4912, LK4913, LK4918, LK4919, LK4921, LK4928, LK4930, LK4931, LK4932, LK4935, LK4936, LK4939, LK4941, LK4944, LK4947, LK4949, LK4951, LK4952, LK4956, LK4961, LK4968, LK4970, LK8901, LP1325, LP1567, LP1568, LP1585, LP1596, LP1806, LP1828, LP3860, LP3977, LP3980, LP3986, LP3997, LP4812, LP4813, LP4814, LP4815, LP4818, LP4819, LP4823, LP4825, LP4828, LP4830, LP4832, LP4843, LP4844, LP4845, LP4850, LP4851, LP4852, LP4857, LP4863, LP4865, LP4914, LP4921, LP4930, LP4934, LP4939, LP4940, LP4941, LP4942, LP4943, LP4944, LP4945, LP4949, LP4957, LP4960, LP4964, LP4965, LP4967, LP4968, LP4974, LP4983, LP4985, LP4989, LP4991, LP4992, LP4999, LP8701, LS3907, 4110345010, 4110345310, 4111410010, 4111415030, 4111417030, 4111418180, 4111438050, 4111438450, 4111510000, 4111510030, 4111510040, 4111510080, 4111510090, 4111510120, 4111530000, 4111540000, 4111540030, 4111540040, 4111540050, 4115530000, 4115530010, 4115530020, 4115530030, 4115530040, 4123520010, 4123520030, 4123520040, 4123520050, 4123520060, 4123520070, 4123520080, 4123520090, 4123520100, 4123520110, 4123520130, 4123520140, 4123520150, 4123520160, 4123520170, 4123520200, 4123520250, 4123520260, 4123520270, 4123520290, 4123520300, 4124420000, 4124420010, 4126360000, 4126360010, 4126360030, 4127040000, 4127040010, 4127040020, 4127040040, 4127040050, 4127040060, 4127040070, 4127040080, 4127040090, 4127040100, 4127040110, 4127040120, 4127040130, 4127040140, 4127040150, 4127040160, 4127040180, 4127040190, 4127040230, 4127040240, 8840090310, 8840166480, 8845034370, 9110048060, 9110048960, 9110070050, 9110070060, 9111000380, 9111000400, 9111000410, 9111000520, 9111000560, 9111000570, 9111000580, 9111000710, 9111000720, 9111000730, 9111000740, 9111000750, 9111000760, 9111000770, 9111000780, 9111000800, 9111000820, 9111000850, 9111001100, 9111001120, 9111001200, 9111001240, 9111420000, 9111450500, 9111450600, 9111455000, 9111455600, 9111460030, 9111530000, 9111530010, 9111530200, 9111535100, 9111535200, 9111535230, 9111535250, 9111535300, 9111535330, 9111535400, 9111535410, 9111535460, 9111535490, 9111535530, 9111536070, 9111539380, 9111539390, 9111539400, 9111539410, 9111539440, 9111539450, 9111545000, 9111545180, 9115010000, 9115010010, 9115010100, 9115010110, 9115010150, 9115010160, 9115010600, 9115030500, 9115040500, 9115040510, 9115040520, 9115040560, 9115040590, 9115040600, 9115045000, 9115045010, 9115045030, 9115045040, 9115045050, 9115045060, 9115050500, 9115050510, 9115051500, 9115051510, 9115060500, 9115060520, 9115060530, 9115060540, 9115065000, 9115065010, 9115065030, 9115065040, 9115065050, 9115140010, 9115140020, 9115150010, 9115160100, 9115165000, 9115530000, 9115530010, 9115530020, 9115530030, 9115530070, 9115531000, 9115531010, 9115531030, 9115531040, 9115531050, 9115532000, 9115532030, 9121120000, 9121120010, 9121140000, 9121160000, 9121170000, 9121250000, 9121420000, 9125100000, 9125100010, 9125100020, 9125101000, 9125101010, 9125101030, 9125101040, 9125101060, 9125102000, 9125102010, 9125103000, 9125103030, 9125120000, 9125120010, 9125120020, 9125120030, 9125120040, 9125120050, 9125120060, 9125120070, 9125120080, 9125140000, 9125140010, 9125140030, 9125140040, 9125140090, 9125180000, 9125180010, 9125180020, 9125180030, 9125180040, 9125182000, 9125182010, 9125182020, 9125182030, 9125182040, 9125182050, 9125182060, 9125182070, 9125420010, 4124420002, 4127049322, 4127049332, 9115038052, 9115539202, 4127049402, 9125129252, 9125129352, 9115058042, 9115530012, 9115539212, 4115539212, 9115148002, 9125109252, 9125128022, 9125129242, 9125129262, 4123529212, 4124428022, 9115049212, 9115049222, 4115539202, 4123529222, 4111518032, 4111518032, 4111519222, 4111540012, 4111540022, 4111548002, 4126369202, 9125109202, 9125109222, 4123529242, 4111519202, 9115048012, 9115048032, 9125189202, 9111539312, 9119068002, 9111549342, 9115159212, 9111539212, SEB01551004, SEB01138004, SEB01052004, SEB01093004, SEB01261004, SEB22583, SEB01515004, SEB22588, SEB01080004, II38147F, II40284F, II40284F000, II40284FAT, K021509, K021509K50, K021510K50, I82806004, K021503K50, K009875, K017529, SEB01697004, SEB01943004, K0009172, K018926, K041489K50, K105789K50