Front Crankshaft Oil Seal Removal

ko90ls · September 15, 2007

Hi everyone!

I am in the process of doing a TB/WP replacement and i want to do the crank seal so i need to do this asap. The Quote below is from the article for a 90 LS. First it details the crank shaft seal replacement and says to use the timing belt removal also:

FRONT CRANKSHAFT OIL SEAL

Removal & Installation

Remove timing belt. See TIMING BELT under REMOVAL &

INSTALLATION in this article. Remove crankshaft timing pulley. Cut oil

seal lip and pry seal from oil pump/front cover housing. Apply

multipurpose grease to new seal lip. Use seal installer and tap in new

seal until outer surface is flush with edge of pump case. Reverse

removal procedure to complete installation.

TIMING BELT

Removal

1) Disconnect cable from negative terminal of battery and

wait 20 seconds. Remove air duct and dust covers. Remove battery.

Remove engine splash shield and drain engine coolant. Remove drive

belt, fan, fluid coupling and fan pulley. Disconnect radiator upper

hose from water inlet. Remove radiator and air cleaner. Disconnect air

cleaner hose from intake air connector pipe. Remove air cleaner,

airflow meter and hose assembly.

2) Remove throttle body cover and disconnect cables. Remove

intake air connector pipe. Remove A/C compressor without disconnecting

hoses and move it aside. Remove power steering pump without

disconnecting hoses. Disconnect air hose from air intake chamber.

Remove upper high tension wire cover. Remove right side engine wiring

cover.

3) Remove left side engine wiring cover. Disconnect PCV hose

from valve on left cylinder head. Remove right and left upper timing

belt covers. Remove high tension wiring and clamps from distributor

caps. Remove left side intermediate timing belt cover and ignition

coil.

NOTE: DO NOT pull or bend wiring, otherwise inside conductor may

be damaged.

4) Remove drive belt idler pulley. Disconnect crank position

sensor connector. Remove right side intermediate timing belt cover.

Remove rubber caps from distributor cap. Remove ignition coil. Remove

water by-pass hose and pipe. Remove left side intermediate timing belt

covers. Disconnect crank position sensor wire from clamp on timing

belt cover. Remove rubber caps from distributor cap.

5) Remove distributor caps. Remove distributor rotors. Remove

distributor housings. Disconnect sensor connector from ignition coil

bracket. Disconnect crank position sensor connector from engine wire.

6) Remove alternator. Remove drive belt tensioner located

above alternator. Remove spark plugs. If reusing timing belt, check

installation marks on timing belt. Ensure there are 4 installation

marks on timing belt. See Fig. 13. If installation marks have

disappeared, place new marks on timing belt before removing each part.

7) Position No. 1 cylinder at TDC (compression). Turn

crankshaft pulley and align groove with "0" timing mark on lower

timing belt cover. Ensure timing marks of camshaft timing pulleys and

timing belt rear plates align. If not, turn crankshaft one revolution

(360 degrees). See Fig. 12.

8) Remove timing belt tensioner. If necessary, place new

installation marks on timing belt to match timing marks of camshaft

timing pulleys. When replacing only timing belt tensioner, use a piece

of string to tension timing belt. Place marks on timing belt and right

camshaft timing pulley. Remove tensioner and dust boot. Preset

tensioner before installing.

9) Loosen tension between left and right camshaft timing

pulleys by slightly turning left pulley clockwise. Disconnect timing

belt from camshaft timing pulleys. Remove camshaft timing pulleys.

10) Using puller, remove crankshaft pulley. Remove fan

support bracket. Remove lower timing belt cover, spacer and gasket.

Remove crank angle sensor plate, which also acts as timing belt guide

plate.

11) Ensure installation reference marks are present. Remove

timing belt. Remove lower idler pulley. Using puller, remove

crankshaft timing belt pulley."

first it shows to remove the timing belt which is why i included it. on #10 of the timing belt it says to remove the crank pulley which i have and in #11 is says use a puller to remove the crankshaft timing belt pulley. also on step #1 of the crankshaft seal it says the same thing. do i use the harmonic balance puller? the set of screw that was I have do not look like they will work and there is nowhere to position the center piece? anyone have any expirence with this?

ko90ls · September 15, 2007

here is a pic from lexls.com it shows the screw holes that i'm gonna try and use

Michael Wu · February 21, 2014

I have recently done the same job.

I went to the local screw specialty store to match up the screw. It's a M6 p1.0 screw. A length of 75mm to 100mm should be fine.

You can check out the photo below.

http://us.lexusownersclub.com/forums/gallery/image/2800-screw-for-removing-the-crankshaft-timing-belt-pulley/

lenore · February 21, 2014

When you replace the seal be sure to look very closely where the seal contacts the crankshaft. If there is a wear line take 1000 grit wet sand paper and clean it up before installing new seal. There is also something called a crankshaft seal saver which is a stainless steel insert that goes over the crank if the wear is really bad. But a quick burnishing on the surface should be all that is needed.