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HM484Q Engine. Manual - part 3

Technique parameters

Technical specification of service

Items

Parameters

Cylinder cover

Height (mm{in})

Standard

124.45

～

124.55{4.8996

～

4.9035}

Maximum grinding
allowance

0.2{0.0078}

Deformation at joint face of
cylinder gasket (mm{in})

Max.

0.03{0.0011}

Deformation at joint face of
manifold (mm{in})

Max.

0.05{0.0019}

Maximum grinding
allowance

0.20{0.0078}

Valve gap (cold status of engine)
(mm{in})

Intake

0.18～0.26{0.007～0.0102}

Exhaust

0.26～0.34{0.0102～0.0133}

Valve and valve guide pipe

Edge thickness
(mm{in})

Intake

Standard

0.85{0.0334}

Min.

0.35{0.014}

Exhaust

Standard

1.50{0.0590}

Min.

0.9{0.035}

Valve length
(mm{in})

Intake

Standard

101.15

～

101.65{3.9822

～

4.0019}

Min.

100.95{3.9744}

Exhaust

Standard

101.07

～

101.57{3.9791

～

3.9988}

Min.

100.87{3.9712}

Valve stem
diameter
(mm{in})

Intake

Standard

4.965～4.980{0.1954～0.1960}

Min.

4.915{0.1935}

Exhaust

Standard

4.955～4.970{0.195～0.1956}

Min.

4.905{0.1931}

I.D. of valve duct (mm{in})

Standard

5-5.012{0.1968-0.1973}

Enlarged size

5.012-5.022{0.1973-0.1977}

Protrusion height of valve guide
pipe (mm{in})

Intake

19.8-20.4{0.7795-0.8031}

Exhaust

14.6-15.2{0.5748-0.5984}

Valve seat

Contact width of valve seat (mm{in})

0.9～1.3{0.0354～0.0511}

Valve seat angle (

º)

Intake

43.5～44

Exhaust

43.5～44

Sink of valve seat (protrusion
height of valve) (mm{in})

Intake

44.37{1.7468}

Exhaust

44.37{1.7468}

Technique parameters

Technical specification of service

Items

Parameters

Valve spring

Height H pressure of
valve spring (N{kgf,
lbf})

Intake

H: 38.8mm {1.528in}

203 ～ 225 {20.71 ～ 22.95,
45.62～50.56}

Exhaust

H: 38.8mm {1.528in}

203 ～ 225 {20.71 ～ 22.95,
45.62～50.56}

Perpendicularity
(mm{in})

Intake

Max.

1.86{0.073}

Exhaust

Max.

1.86{0.073}

Valve oil seal

Depth L (mm{in})

Intake

22.1{0.87}

Exhaust

16.9{0.665}

Camshaft

Axial run-out of camshaft
(mm{in})

Max.

0.03{0.0012}

Protrusion height of
cam (mm{in})

Intake

Standard

43.81{1.7248}

Min.

43.61{1.7169}

Exhaust

Standard

43.78{1.7236}

Min.

43.58{1.7157}

Journal diameter (mm{in})

Standard

25.936～25.965{1.0211～
1.0222}

Min.

25.906{1.0199}

Journal gap (mm{in})

Standard

0.035～0.085{0.0014～0.0033}

End gap (mm{in})

Standard

0.08～0.20{0.0031～0.0078}

Max.

0.21{0.0082}

Tappet

Tappet hole diameter (mm{in})

Standard

31.000～31.025{1.2205～
1.2215}

Tappet diameter (mm{in})

Standard

30.964～30.980{1.2191～
1.2197}

Gap between tappet and tappet
hole (mm{in})

Standard

0.020～0.061{0.00079～
0.00240}

Max.

0.180{0.0071}

Cylinder block

Height (from top surface to main
cover boundary line) (mm{in})

Standard

273.5{10.7677}

Maximum grinding
allowance

0.20{0.008}

Deformation at top surface
(mm{in})

Standard

0.05{0.002}

Technique parameters

Technical specification of service

Items

Parameters

Cylinder bore diameter
[measured at 37mm (1.45in)
below top surface] (mm{in})

Standard

84.00～84.03{3.3071～3.3083}

Oversize: 0.25{0.01}

84.25～84.28{3.3169～3.3181}

Oversize: 0.50{0.02}

84.50～84.53{3.3268～3.3279}

Wearing limit (mm{in})

0.15{0.006}

Piston diameter (mm{in})
[Measured at 28mm {1.1in} below
lower edge of oil ring groove,
perpendicular to the piston pin
hole axis]

Standard

83.97～84{3.305～3.3071}

Oversize: 0.25{0.01}

84.22～84.25{3.3157～3.3169}

Oversize: 0.50{0.02}

84.47～84.50{3.3256～3.3268}

Gap between piston and cylinder
bore (mm{in})

Standard

0.02～0.04{0.0008～0.0016}

Max.

0.10{0.004}

Piston ring

Gap between
piston ring and
ring groove
(mm{in})

Top ring

Standard

0.030～0.070{0.0012～0.0027}

Second ring

Standard

0.020～0.060{0.0008～0.0024}

Oil ring

Standard

0.040～0.120{0.0016～0.0047}

Top ring/second
ring

Max.

0.15{0.006}

Oil ring

Max.

0.15{0.006}

Opening gap[measured
within cylinder] (mm{in})

Top ring

0.20～0.35{0.008～0.014}

Second ring

0.30～0.45{0.012～0.018}

Oil ring

0.20～0.50{0.008～0.020}

Max.

1.0{0.039}

Piston pin

Piston pin diameter (mm{in})

Standard

19.002～19.005{0.7481～
0.7482}

Piston pin hole diameter (mm{in})

Standard

19.010～19.015{0.7484～
0.7486}

Gap between small end hole of
connecting rod and piston pin (mm{in})

Standard

-0.031～-0.017{-0.0013～
-0.0007}

Gap between piston pin hole and piston
pin (mm{in})

Standard

0.005～0.013{0.000～0.0005}

Connecting rod and connecting rod bearing

Length [from center to
center] (mm{in})

Standard

139.9～140{5.5118～5.5079}

Small end bore diameter of
connecting rod (mm{in})

Standard

18.974～18.985{0.7476～
0.7474}

Connecting rod end gap

Standard

0.100～0.250{0.004～0.010}

Technique parameters

Technical specification of service

Items

Parameters

(mm{in})

Max.

0.30{0.012}

Connecting rod bush size
(mm{in})

Standard

1.487～1.499{0.05854～
0.05902}

0.25{0.01} reduced size

1.612～1.624{0.06346～
0.06394}

0.50{0.02} reduced size

1.737～1.749{0.06839～
0.06886}

Technical specification of service

Items

Parameters

Connecting rod bearing gap
(mm{in})

Standard

0.015～0.048{0.0006～0.0019}

Max.

0.10{0.0039}

Crankshaft

Axial run-out of crankshaft (mm{in})

0.03{0.0012}

Main journal diameter
(mm{in})

Standard

49.982～50.000{1.9678～
1.9685}

0.25{0.01} reduced size

49.732～9.75{1.9580～1.9586}

Main journal gap (mm{in})

Standard

0.018～0.036{0.00071～
0.00142}

Max.

0.1{0.0039}

Main shaft bush size
(mm{in})

Standard

1.988～2.003{0.0783～0.0789}

0.25{0.01} reduced size

2.113～2.128{0.0831～0.0837}

Crank pin diameter
(mm{in})

Standard

44.980～45.000{1.7709～
1.7717}

0.25{0.01} reduced size

44.730～44.750{1.7610～
1.7618}

0.50{0.02} reduced size

44.480～44.500{1.7512～
1.7520}

Crankshaft

Thrust bearing size (mm{in})

Standard

1.925～1.975{0.0758～0.0778}

0.25{0.01} reduced size

2.050～2.100{0.0807～0.0827}

0.50{0.02} reduced size

2.175～2.225{0.0856～0.0876}

0.75{0.03} reduced size

2.300～2.350{0.0906～0.0925}

Crankshaft end gap (mm{in})

Standard

0.05～0.25{0.002～0.010}

Max.

0.30{0.012}

Onboard checking

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