約翰迪爾John Deere柴油發(fā)動機氣缸蓋厚度燃燒面平整度磨損極限值參數(shù)
檢查并清潔氣缸蓋
1.檢查約翰迪爾John Deere柴油發(fā)動機燃燒面是否有熱罐物理損壞或損壞的跡象損壞、機油或冷卻液泄漏或墊片故障解決方案。
如果有證據(jù)表明存在3.在化學(xué)熱罐中清潔氣缸蓋,或使用物理損傷;例如開裂、磨損、溶劑和刷子。變形或閥座“燒焦”。檢查所有氣缸蓋通道是否受限。4.用壓縮空氣干燥并吹凈所有通道。
2.刮去5上的墊片材料、油、碳和鐵銹。重新安裝從缸蓋和缸蓋上拆下的螺塞。使用動力黃銅或銅絲刷擰緊至以下規(guī)格。
清潔密封表面。
規(guī)格
重要事項:確保在缸蓋螺塞扭矩為60 N·m(44 lb-ft)之前拆下所有螺塞
清潔頭,作為零件可以
檢查約翰迪爾John Deere柴油發(fā)動機氣缸蓋燃燒面平整度
使用D05012ST精密直尺和塞尺檢查缸蓋平面度。在多個位置進行縱向、橫向和對角檢查。
如果任何測量值超過規(guī)格,則必須重新表面處理或更換氣缸蓋。請參見測量氣缸蓋厚度在這個組的后面。
檢查氣缸蓋的平面度(1)
規(guī)格
氣缸蓋最大允許超出平面整個長度或?qū)挾取?/span>0.08毫米(0.003英寸)任何305 mm(12in.)長度……在0.025毫米(0.001英寸)內(nèi)
測量約翰迪爾John Deere柴油發(fā)動機氣缸蓋厚度測量從氣門室蓋墊片導(dǎo)軌到燃燒面的缸蓋厚度(A)。
規(guī)格
氣缸蓋厚度……155.45-155.71 mm(6.120-6.130英寸)
磨損極限
燃燒面表面光潔度(僅表面研磨至AA154.69毫米(6.09英寸)光潔度)…1.5-2.8微米(60-110微英寸)最大波深……0.012毫米(0.0005英寸)
如果約翰迪爾John Deere柴油發(fā)動機氣缸蓋厚度小于磨損極限,請勿嘗試重新表面處理。安裝新的缸蓋。
規(guī)格
最大重壓頭
材料移除……0.762毫米(0.030英寸)
氣缸蓋厚度
A頭厚度
注:如有必要對約翰迪爾John Deere柴油發(fā)動機氣缸蓋進行重新表面處理,可從新零件尺寸研磨最大0.762 mm(0.030 in.)。僅移除恢復(fù)平整度所需的部分。
重要事項:重新表面處理后,按照前面所述檢查平整度,并檢查缸蓋燃燒面上的表面光潔度。
研磨后檢查閥凹槽。(參見測量閥凹槽序列
本組中較早的數(shù)字(200000-)可研磨閥面,使該特性符合規(guī)范要求。
Inspect and Clean Cylinder Head Serial Number (200,000— )
1. Inspect combustion face for evidence of physical damaged or destroyed by hot tank
damage, oil or coolant leakage, or gasket failure solutions.
replace cylinder head if there is evidence of 3. Clean cylinder head in a chemical hot tank, or with
physical damage; such as cracking, abrasion, solvent and a brush. distortion, or valve seat “torching”. Inspect all
cylinder head passages for restrictions. 4. Dry with compressed air and blow out all passages.
2. Scrape gasket material, oil, carbon, and rust from 5. Reinstall plugs removed from cylinder head and head. Use a powered brass or copper wire brush to tighten to the following specifications.
clean sealing surfaces.
Specification
IMPORTANT: Be sure to remove all plugs before Cylinder Head Plugs—Torque.................................. 60 N•m (44 lb-ft)
cleaning head, as parts can be
Check Cylinder Head Combustion Face Flatness Serial Number (200,000— )
Check cylinder head flatness using D05012ST Precision Straightedge and feeler gauge. Check lengthwise, crosswise, and diagonally in several places.
If any measurement exceeds specification, the cylinder head must be either resurfaced or replaced. See MEASURE CYLINDER HEAD THICKNESS (200,000— )
later in this group.
Checking Flatness of Cylinder Head (1)
Specification
Cylinder Head—Maximum Acceptable Out-of-Flat Over
Entire Length or Width ....... 0.08 mm (0.003 in.)
Straightness Per Any 305 mm (12
in.) Length ......... Within 0.025 mm (0.001 in.)
Measure Cylinder Head Thickness Serial Number (200,000— )
Measure head thickness (A) from valve cover gasket rail-to-combustion face.
Specification
Cylinder Head—Thickness ...... 155.45—155.71 mm
(6.120—6.130 in.)
Wear Limit .....
Combustion Face Surface Finish (Surface Mill Only to AA
154.69 mm (6.09 in.)
Finish) ......... 1.5—2.8 micrometers
(60—110 micro-in.) Maximum Wave Depth ........ 0.012 mm (0.0005 in.)
If cylinder head thickness is less than wear limit, DO NOT attempt to resurface. Install a new cylinder head.
Specification
Resurfacing Head—Maximum
Material Removal....... 0.762 mm (0.030 in.)
Cylinder Head Thickness
A—Head Thickness
NOTE: If necessary to resurface cylinder head, a MAXIMUM of 0.762 mm (0.030 in.) can be ground from new part dimension. Remove ONLY what is necessary to restore flatness.
IMPORTANT: After resurfacing, check flatness as described earlier and check surface finish on combustion face of head.
Check valve recess after grinding. (See MEASURE VALVE RECESS SERIAL
NUMBER (200,000— ) earlier in this group.) Valve face may be ground to bring this characteristic within specification.
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