rear main seal

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Aug 2, 2006 | 09:19 PM

firebug

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Senior User

Joined: Jan 2003

Posts: 156

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From: East Texas

rear main seal

how hard is it to replace the rear main seal on 7.3 L with the tranny out (at shop being rebuilt)?

Aug 3, 2006 | 04:50 AM

Cuda_jim

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Joined: Oct 2003

Posts: 5,903

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From: MICHIGAN

Taking the tranny out is the gardest part. This is from the repair manual.
Crankshaft Rear Oil Seal

<TABLE cellSpacing=0 cellPadding=3 border=1><CAPTION>SPECIAL SERVICE TOOL(S) REQUIRED</CAPTION><TBODY><TR><TH vAlign=bottom align=middle>Description</TH><TH vAlign=bottom align=middle>Tool Number</TH></TR><TR><TD style="BORDER-BOTTOM: medium none" vAlign=top align=left>Rear Crank Service Set</TD><TD style="BORDER-BOTTOM: medium none" vAlign=top align=left>T94T-6701-AH</TD></TR><TR><TD style="BORDER-BOTTOM: medium none" vAlign=top align=left>Rear Wear Ring Remover</TD><TD style="BORDER-BOTTOM: medium none" vAlign=top align=left>T94T-6701-AH1</TD></TR><TR><TD style="BORDER-BOTTOM: medium none" vAlign=top align=left>Crankshaft Rear Wear Ring Remover Sleeve</TD><TD style="BORDER-BOTTOM: medium none" vAlign=top align=left>T94T-6701-AH2</TD></TR><TR><TD style="BORDER-BOTTOM: medium none" vAlign=top align=left>Crankshaft Seal Replacer</TD><TD style="BORDER-BOTTOM: medium none" vAlign=top align=left>T94T-6701-AH3</TD></TR><TR><TD style="BORDER-TOP: medium none" vAlign=top align=left>Crankshaft Seal Replacer</TD><TD style="BORDER-TOP: medium none" vAlign=top align=left>T94T-6701-AH4</TD></TR><TR><TD vAlign=top align=left>Forcing Screw</TD><TD vAlign=top align=left>T84T-7025-B</TD></TR><TR><TD vAlign=top align=left>Remover Tube</TD><TD vAlign=top align=left>T77J-7025-B</TD></TR><TR><TD vAlign=top align=left>Driver Sleeve</TD><TD vAlign=top align=left>T79T-6316-A4</TD></TR></TBODY></TABLE>

Removal
Remove the flywheel (6375).

Remove the five crankshaft rear oil seal retaining bolts and the crankshaft rear oil seal (6701).

Clean the crankshaft rear oil seal sealing surfaces.

Inspect the crankshaft rear oil seal for damage. Replace as necessary.

If equipped with a crankshaft wear sleeve, use Crankshaft Rear Wear Ring Remover T94T-6701-AH1, Forcing Screw T84T-7025-B, Remover Tube T77J-7025-B and Crankshaft Rear Wear Ring Remover Sleeve T94T-6701-AH2 to remove the crankshaft rear wear sleeve.

<TABLE cellSpacing=0 cellPadding=3 width="70%" border=1><TBODY><TR><TH vAlign=bottom>Item</TH><TH vAlign=bottom>Part Number</TH><TH vAlign=bottom>Description</TH><TR vAlign=top><TD>1</TD><TD>—</TD><TD>Crankshaft Wear Ring (Part of 6701)</TD></TR><TR vAlign=top><TD>2</TD><TD>T94T-6701-AH1</TD><TD>Crankshaft Rear Wear Ring Remover </TD></TR><TR vAlign=top><TD>3</TD><TD>T84T-7025-B</TD><TD>Forcing Screw </TD></TR><TR vAlign=top><TD>4</TD><TD>T77J-7025-B</TD><TD>Remover Tube </TD></TR><TR vAlign=top><TD>5</TD><TD>T94T-6701-AH2</TD><TD>Crankshaft Rear Wear Ring Remover Sleeve (if Installed)</TD></TR></TBODY></TABLE>

Installation

Apply Silicone Rubber F5TZ-19G204-AB or equivalent meeting Navistar specification D15-5012 Type 2 to the rear oil seal retaining ring and five crankshaft rear oil seal retaining bolts.

Using Crankshaft Seal Replacer T94T-6701-AH3, Crankshaft Seal Replacer T94T-AH4 and if wear sleeve is to be replaced, Driver Sleeve T79T-6316-A4 and guide pins (part of T79T-6316-A), install crankshaft wear ring and crankshaft rear oil seal.

<TABLE cellSpacing=0 cellPadding=3 width="70%" border=1><TBODY><TR><TH vAlign=bottom>Item</TH><TH vAlign=bottom>Part Number</TH><TH vAlign=bottom>Description</TH><TR vAlign=top><TD>1</TD><TD>—</TD><TD>Guide Pins (Part of T79T-6316-A)</TD></TR><TR vAlign=top><TD>2</TD><TD>T94T-6701-AH4</TD><TD>Crankshaft Seal Replacer</TD></TR><TR vAlign=top><TD>3</TD><TD>T94T-6701-AH3</TD><TD>Crankshaft Seal Replacer</TD></TR><TR vAlign=top><TD>4</TD><TD>T79T-6316-A4</TD><TD>Driver Sleeve</TD></TR><TR vAlign=top><TD>5</TD><TD>6701</TD><TD>Crankshaft Rear Oil Seal</TD></TR></TBODY></TABLE>