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2010-06-22 203800 A11995 Town Car/Crown Victoria/Grand Marquis
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Section 03-01: Engine, 4.6L (2V) IN-VEHICLE SERVICE
1995 Town Car/Crown Victoria/Grand Marquis Workshop Manual
Camshaft Timing Chains and Tensioners
SPECIAL SERVICE TOOL(S) REQUIRED
Description
Tool Number
Cam Positioning Tool
T91P-6256-A
Cam Positioning Tool Adapters T92P-6256-A
Crankshaft Holding Tool
T93P-6303-A
Removal
1.
CAUTION: At no time, when the timing chain(s) are removed and the cylinder heads (6049) are installed, may the crankshaft (6303) and/or camshafts (6250) be
rotated. Failure to follow these directions will result in valve and/or piston damage.
NOTE: Because this is not a free-wheeling engine, and it "jumps time," there will be damage to the valves and/or pistons (6108) and will require the removal of the cylinder heads . The camshaft sprockets (6256) should only be disassembled from the camshafts when one of the components is to be replaced.
Remove valve covers (6582) , oil pan (6675) and engine front cover (6019) as outlined.
2. Remove crankshaft position sensor pulse wheel.
3. Rotate engine to No. 1 top dead center (TDC).
4. NOTE: This will prevent accidental rotation of the camshafts . NOTE: Cam Positioning Tool Adapters T92P-6256-A and Cam Positioning Tool T91P-6256-A must be installed on camshaft to prevent camshaft from rotating. Install Cam Positioning Tool Adapters T92P-6256-A and Cam Positioning Tool T91P-6256-A on flats of camshaft .
5. Remove two bolts retaining RH timing chain tensioner (6L266) to cylinder head and remove timing chain tensioner . 6. Remove RH timing chain tensioner arm (6L253). 7. Remove two bolts retaining RH timing chain guide (6K297) to cylinder head and remove timing chain guide . 8. Remove RH timing chain from camshaft sprocket and crankshaft sprocket (6306) . 9. NOTE: Cam Positioning Tool Adapters T92P-6256-A and Cam Positioning Tool T91P-6256-A must be installed on camshaft to prevent camshaft from rotating.
Remove two bolts retaining LH timing chain tensioner to cylinder head and remove timing chain tensioner . 10. Remove LH timing chain tensioner arm. 11. Remove two bolts retaining LH timing chain guide to cylinder head and remove timing chain guide . 12. Remove LH timing chain from camshaft sprocket and crankshaft sprocket . 13. If necessary, remove camshaft sprockets and crankshaft sprockets as outlined.
14.
CAUTION: Do not rotate crankshaft and/or camshafts or possible engine damage may occur.
Inspect the plastic running face on timing chain tensioner arms and timing chain guides . If worn or damaged, remove and clean oil pan and oil pump screen cover and tube (6622) .
Installation
1. NOTE: If engine has "jumped time," ensure that all repairs to engine components and/or valve train have been made. Then rotate engine counterclockwise 45 degrees. This will position all pistons below top of deck face. Install cylinder heads as outlined.
NOTE: Cam Positioning Tool Adapters T92P-6256-A and Cam Positioning Tool T91P-6256-A must be installed on camshaft, to prevent camshafts from rotating.
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Install timing chain guides (both sides). Install timing chain guide retaining bolts. Tighten to 8-12 Nm (71-106 lb-in). 2. If removed, position LH camshaft sprocket spacer (6265) and camshaft sprocket on camshaft . 3. Install washer and camshaft sprocket retaining bolt. Do not tighten at this time. 4. If removed, position RH camshaft sprocket spacer and camshaft sprocket on camshaft . 5. Install washer and camshaft sprocket retaining bolt. Do not tighten at this time.
Item 1 2 3 4 5 6 7 8 9 10 11 A B
Part Number 6250 6303 6K297 6306 N806070-S 6K297 N806139-S2 N806164-S 6268 6256 6265 -- --
Description Camshaft Crankshaft Timing Chain Guide (LH) Crankshaft Sprocket (2 Req'd) Bolt (2 Req'd Each Side) Timing Chain Guide (RH) Bolt (1 Req'd Each Side) Washer (1 Req'd Each Side) Timing Chain (RH) Camshaft Sprocket Camshaft Sprocket Spacer (1 Req'd Each Side) Tighten to 8-12 Nm (71-106 Lb-In) Tighten to 110-130 Nm (81-95 Lb-Ft)
6. NOTE: Crankshaft sprockets are identical. They may only be installed one way. Refer to the following illustration for proper crankshaft sprocket installation.
NOTE: Make sure tapered part of crankshaft sprocket faces away from cylinder block (6010) . If, removed, install LH crankshaft sprocket.
7. NOTE: If copper links of timing chain are not visible, split both timing chains in half and mark the two opposing links as shown. Install LH timing chain on camshaft sprocket . Make sure copper link of timing chain lines up with timing mark of camshaft sprocket .
8. Install LH timing chain on crankshaft sprocket . Make sure copper link of timing chain lines up with timing mark of crankshaft sprocket . 9. NOTE: Make sure tapered part of crankshaft sprocket faces toward cylinder block .
If removed, install RH crankshaft sprocket. 10. Install RH timing chain on camshaft sprocket . Make sure copper link of timing chain lines up with timing mark of camshaft sprocket.
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11. Install RH timing chain on crankshaft sprocket . Make sure copper link of timing chain lines up with timing mark of crankshaft sprocket .
Item 1 2 3 4 5 6 7 8
-- -- -- -- -- -- 6306 --
Part Number
Description RH Camshaft Timing Chain Mark RH Camshaft Sprocket Mark LH Camshaft Timing Chain Mark RH Camshaft Sprocket Mark Crankshaft Sprocket Mark Crankshaft Timing Chain Mark Crankshaft Sprocket Crankshaft Keyway Center Line
12. Install RH and LH timing chain tensioner and secure with two bolts on each. Tighten bolts to 20-30 Nm (15-22 lb-ft). 13. Install Crankshaft Holding Tool T93P-6303-A over crankshaft and engine front cover alignment dowel to position crankshaft.
14. Lubricate timing chain tensioner arm contact surfaces with clean engine oil and install RH and LH timing chain tensioner arms on their dowels.
Item 1 2 3 4 5 6 7 8 9 A
Part Number 6049 6049 N806040-S 6L253 6L266 N606543-S2 -- 6L266 6L253 --
Description Cylinder Head (RH) Cylinder Head (LH) Dowel Timing Chain Tensioner Arm (LH) Timing Chain Tensioner (LH) Bolt (2 Req'd) Lock Pin (Part of 6L266) Timing Chain Tensioner (RH) Timing Chain Tensioner Arm (RH) Tighten to 20-30 Nm (15-22 Lb-Ft)
15. With a suitable C-clamp around the timing chain tensioner arm and timing chain guide , remove all slack from timing chain while using caution not to bend the timing chain guide . 16. Remove lock pins from timing chain tensioners and make sure all timing marks are aligned.
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1995 Town Car/Crown Victoria/Grand Marquis
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17. Using Cam Positioning Tool Adapters T92P-6256-A and Cam Positioning Tool T91P-6256-A to align camshaft , tighten camshaft sprocket bolt to 110-130 Nm (81-95 lb-ft). 18. NOTE: If not at maximum lift, loosen camshaft sprocket bolt and repeat Steps 12-15.
Install Rotunda Dial Indicator with Bracketry 014-00282 or equivalent in cylinder 1 spark plug hole. Check that camshaft is at maximum lift for the intake valve (6507) at 114 degrees after top dead center (TDC). 19. Remove Cam Positioning Tool Adapters T92P-6256-A, Cam Positioning Tool T91P-6256-A and Crankshaft Positioning Tool T93P-6256-A. 20. Install engine front cover , oil pan and valve covers as outlined. 21. Start engine and check for leaks and proper operation.
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