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How To : Timing Belt & Water Pump 1991 LS400

#1 User is offline   92Lex Icon

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Posted 23 October 2004 - 11:01 PM

Tools required :
Breaker bar
Socket wrench
A couple of extenstions
Torque wrench capable of reading at least 181 lbs
Sockets - 8mm, 10mm, 14mm, 17mm, 22mm, 10mm hex
Harmonic balancer remover

Parts replaced:
Timing belt
Water pump
No.1 idler pulley
No.2 idler pulley
Tensioner

Additional recommended parts to replace:
Spark plugs
Distributor caps
Distributor rotors
Spark plug wires
Air filter
Thermostat
Front crankshaft oil seal
Camshaft oil seals
Serpentine belt


Remove air duct - (1) 10mm bolt :
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#2 User is offline   92Lex Icon

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Posted 24 October 2004 - 01:55 AM

Take off dust cover, then unhook the clamp, (1) 10mm bolt then air filter housing:
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#3 User is offline   92Lex Icon

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Posted 24 October 2004 - 01:58 AM

Disconnect the plug leading to the Mass Air Flow sensor from this and remove the 2 bolts and loosen clamp:
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#4 User is offline   92Lex Icon

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Posted 24 October 2004 - 02:00 AM

Remove those 2 hoses to the right, 2 bolts then loosen the clamp to the throttle body and remove throttle body cover and air cleaner assembly:
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This is the assembly that you have to remove those 2 hoses, clamp, throttle body cover and 2 screws from. Once you have the rectangle cover (throttle body cover) from the picture above off, remove this assembly:
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#5 User is offline   92Lex Icon

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Posted 24 October 2004 - 02:03 AM

Drain radiator coolant from radiator before you proceed with this next step. Disconnect coolant hose from thermostat housing:
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#6 User is offline   92Lex Icon

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Posted 24 October 2004 - 02:07 AM

Remove this bolt and the one on the other side to remove the radiator, disconnect the 2 ATF hoses at the bottom of the radiator...then remove radiator. Your bolts are probally bigger because someone replaced mines with different bolts:
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#7 User is offline   92Lex Icon

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Posted 24 October 2004 - 02:10 AM

Remove fan clutch:
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Remove fan clutch by loosening these 4 bolts behind it:
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#8 User is offline   92Lex Icon

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Posted 24 October 2004 - 02:13 AM

Remove drive belt by placing your wrench/rachet over this bolt and turning it counter clockwise while using your other hand to guide the belt off:
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#9 User is offline   92Lex Icon

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Posted 24 October 2004 - 02:15 AM

Remove upper high tension cord holder-(2)10mm bolts:
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Posted 24 October 2004 - 02:18 AM

Remove right head engine wire cover-(1)10mm bolt:
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#11 User is offline   92Lex Icon

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Posted 24 October 2004 - 02:20 AM

Remove oil cap and (2)10mm bolts to remove left head engine wire cover:
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Posted 24 October 2004 - 02:30 AM

Disconnect the small vacuum hose, remove (4)10mm bolts to remove left head timing belt cover, then do the same for the right head timing belt cover:
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#13 User is offline   92Lex Icon

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Posted 24 October 2004 - 02:38 AM

Remove drive belt idler pulley:
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#14 User is offline   92Lex Icon

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Posted 24 October 2004 - 02:46 AM

Locate 10mm and 12mm screws and remove them, then disconnect sensors, water bypass pipe then remove timing belt covers for right head and left head of engine (timing belt covers are the 2 plastic things covering half of the distributor caps):
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Torque specs: 10mm-69in-lb
12mm-12ft-lb
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#15 User is offline   92Lex Icon

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Posted 24 October 2004 - 02:50 AM

Remove distributor caps (3)8mm screws:
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Torque specs: 34in-lb
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