Cummins N14 – Cylinder Head Capscrew Holes – Repairing

Components included in the capscrew thread repair kit, Part No. 3376208, for the N14 block are as follows:

Remove any burrs from the top deck surface of the cylinder block. A flat mill file is very effective for this process.
Burr removal is necessary so that you can get an accurate fixture location.

Align the fixture with the failed capscrew hole. Install the reamer base plate and the guide bar to the cylinder block.
Position the guide bar over the capscrew hole to be repaired. Using a tapered locator, center the guide bar and
the bushing over the capscrew hole.

Tighten the guide bar and bushing assembly. Remove the tapered locator.

Ream the failed capscrew hole to the full depth of the hole.

Use a chip removing unit to remove reamer chips from the capscrew hole.

Set the tap stop collar to the correct height, using the insert to be installed. Tap the capscrew hole.
NOTE: It can be necessary to stop, remove the tap, and remove chips from the hole several times before achieving
full depth.

Use a chip removing unit to clean the capscrew hole of shavings and debris. Remove the tap.

Clean and flush the newly cut threads with safety solvent, Part No. 3823717. Use a chip removing unit to clean the
capscrew hole of shavings and debris, and allow to dry.
Lightly spray the threads with Loctiteா Primer-T, Part No. ST-1272-13, and allow to dry.

Prepare the thread insert for installation. Put the jam nut on a cylinder head capscrew. Install the repair insert on
the capscrew until it contacts the jam nut.

Clean and flush the outside diameter of the repair insert with safety solvent and allow to dry. Lightly spray with
Loctiteா Primer-T, Part No. ST-1272-13, and allow to dry.

Apply four beads of sealant, Part No. 3823718, to the outside diameter of the closed end thread insert. The
beads of sealant must be approximately 1/32-inch wide and 90 degrees apart. Each bead must be the full length
of the external threaded portion of the insert.

Install and tighten the repair insert.

Loosen the jam nut. Remove the cylinder head capscrew and jam nut arrangement.

Correct installation will provide 0.00 mm to 0.50 mm [0.000-inch to 0.020-inch] protrusion above the cylinder
block surface.

File the top of the thread repair insert even with the cylinder head mounting surface.

Make sure the inside portion of the repair insert is clean.
Remove any file shavings or debris.

Before tightening the cylinder head capscrews, allow the sealant to cure for 3 hours.

07. March 2021 by samuel
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Cummins N14 – Coolant Passage – Repairing

The coolant passage repair kit, Part No. 3823679, consists of the following components:

Sealing and retaining compound is also available in a 250 ml bottle, Part No. 3823689.
The coolant passage repair inserts for the N14 cylinder block are available in packages of 50, tool Part No.
3823688.
NOTE: If the reamer extends too far down in the hole, it will hit the radius of the coolant jacket and deflect the drill sideways, causing the hole to be out of round. Severely out of round holes will affect the performance of the insert.

Ream through with the 29/64-inch reamer.

Set the tap depth with the tap stop to one inch.

Tap until the stop contacts the cylinder block head deck surface.

Clean the threads with safety solvent, Part No. 3823717.
Allow to dry.

Clean the coolant passage insert with a safety solvent, Part No. 3823717.
Allow to dry.

Liberally apply the sealing and retaining compound to the coolant passage insert threads.

Start the insert with your fingers, and install it approximately half way.

Liberally apply the sealing and retaining compound to the upper half of the thread, and finish installing with the
installation tool.

Blend the top of the insert and the block with a file.

 

07. March 2021 by samuel
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Cummins N14 – Cylinder Block – Deck Resurfacing

Refer to the Alternative Repair Manual, Bulletin No. 3379035.

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Cummins N14 – Cylinder Block – Cylinder Head Capscrew Holes – Inspection

Inspect the capscrew bosses for cracks or porosity that extend into the coolant cavities or that have damaged
threads.
Thread repair inserts can be used to fix most cases of thread damage and minor cracks. Refer to Cylinder Head
Capscrew Hole Repair in Section 1-03.

Closed end thread repair inserts can be used in conjunction with upper counterbore sleeves (0.020-inch oversize
on the outside diameter or smaller), and coolant passage repair inserts.

Cylinder blocks with vertical cracks that extend down over the counterbore ledge that can not be machined out
using a 0.750-inch long sleeve can not be repaired.
In this case, the cylinder block must be replaced.

Mark all cylinder head capscrew holes that are to be repaired. Refer to Cylinder Block Machining – Cylinder
Head Capscrew Hole Repair in Section 1-03.

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Cummins N14 – Cylinder Block – Coolant Passage – Inspection

Check the water holes. If erosion or pitting is more than 0.08 mm [0.003-inch] deep or extends more than 2.41
mm [0.095-inch] from the edge of the hole, the water hole must be repaired. Refer to Cylinder Block Machining –
Coolant Passage Repair later in this section for details.

 

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Cummins N14 – Cylinder Block – Cylinder Block – Inspection

Caution: All measurements of the cylinder block must be made when the block is positioned on a flat surface.
If the block is mounted on the engine stand, the measurements can be wrong because of distortion.
Inspect the gasket surfaces.
Visually inspect for burrs or damage.
Use an Arkansas hone or a crocus cloth to remove the burrs.

Check the top surface of the block for wear. If fretting damage, scratches, cracks, or corrosion deeper than 0.08 mm [0.003-inch] are present in an area where a head gasket seal ring or a grommet makes contact, the surface must be repaired. There must not be any defect which extends more than 2.41 mm [0.095-inch] from the edge of the coolant passage.
Fretting damage in any other area is acceptable if it does not change the protrusion measurement of the counter-
bore or the cylinder liner.
Refer to the Alternative Repair Manual, Bulletin No. 3379035, for machining instructions.

Use a 610 mm [24 inches] caliper to measure the height of the cylinder block from the main bearing bore outside
diameter to the cylinder head deck surface.

If the height of the block is less than 422.12 mm [16.619 inches], a 0.25 mm [0.010-inch] oversize head gasket
must be used.

The height of the block must not vary more than 0.05 mm [0.002-inch] from end to end of the block. If the block
height is not within specifications, the top surface of the block must be machined or the block must be replaced.
NOTE: If the top surface of the block is machined, the ledge depth of the cylinder liner counterbore must be machined.
Refer to the NH/NT Counterbore Troubleshooting and Repair Manual, Bulletin No. 3810450, or the N14 Trou-
bleshooting and Repair Manual, Bulletin No. 3810456, for detailed instructions.

To inspect the cylinder liner counterbore, refer to the NH/NT Counterbore Troubleshooting and Repair Man-
ual, Bulletin No. 3810450, or the N14 Troubleshooting and Repair Manual, Bulletin No. 3810456, for complete
instructions.

07. March 2021 by samuel
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Cummins N14 – Cylinder Block – Cleaning and Inspection – Main Bearing Bore Alignment – Measurement

NOTE: Service caps do not have the bore machined to a final specification. If the cap is replaced, the main bearing
bore must be machined. Use the correct parts of the main bearing boring tool, Part No. ST-1177. Refer to the Alternative Repair Manual, Bulletin No. 3379035.

Use two centering rings, Part No. ST-1177-39 [4.750 inches diameter]. Put the rings in the No. 2 and the No.
6 main bearing locations.

Use clean 15W-40 oil to lubricate the main bearing capscrew threads and the flat washers.
Drain the excess oil from the capscrews before installing them.

Caution: The main bearing caps are marked for position
(1) on the camshaft side and the cylinder block identification (2) on the exhaust side. The cylinder block identification number (3) is stamped on the pan rail on the camshaft side of the block. Install the caps in the correct
position with the position number to the camshaft side and its part number toward the rear of the engine.
Install the main bearing caps as follows:
1. Align the capscrew holes in the cap with the holes in
the cylinder block.

2. Install the capscrews and the washers through the cap and into the cylinder block.
3. Use your hand to tighten the capscrews two to three threads.

4. Hit the cap with a rubber mallet to push it into the correct position.
NOTE: The main bearing caps must not have any side clearance with the block.

Put the checking ring into the cylinder block main bearing saddle. Put the main bearing cap over the checking ring.

Tighten the main bearing cap capscrews to the following torque values in the sequence shown:
1. Tighten to 120 N•m [90 ft-lb].
2. Tighten to 230 N•m [170 ft-lb].
3. Tighten to 345 N•m [255 ft-lb].
4. Loosen completely.
5. Repeat steps No. 1 through No. 3.

Use clean 15W-40 oil to lubricate the bores of the two centering rings, Part No. ST-1177-39, and the checking
bar, Part No. ST-1177-16.

Insert the bar through the centering rings while slowly rotating the bar. The bar must turn easily.
If the bar does not turn easily, check to make sure the main bearing caps are installed correctly. If they appear
to be okay, move one of the centering rings to another bearing location.

Apply lubrication to the outside diameter of the checking ring.

Use your hands to install the checking ring into the main bearing bore. If the ring will not slide through the bore,
check the bore for burrs. If the ring will still not slide through the bore, the bore is undersize and must be repaired.
Refer to the Alternative Repair Manual, Bulletin No. 3379035, for repair procedures.

Use a 0.08mm[0.003-inch] feeler gauge that is not more than 13 mm [0.5-inch] wide.
Center the checking ring in the bore. Try to put the feeler gauge between the checking ring and the bore. Rotate
the gauge in the bore at both sides of the checking ring.

The bore alignment of the main bearing is okay if:
• the gauge does not enter at any point.
• the gauge will enter but will not slide through or around the bore and the alignment bar will rotate with the gauge       inserted.

The bore alignment of the main bearing is not okay if:
• the gauge enters and slides around the bore. This means that the bore is oversize and must be repaired.
• the gauge will enter on one side only but can slide around the bore. This means that the bore is tapered
and must be repaired.

If the tools to check the main bearing bore alignment are not available, use a dial bore indicator to measure the
main bearing bore inside diameters.
NOTE: This procedure does not check main bearing bore alignment but will identify bore diameters that do not meet
specifications.
NOTE: Support the rear portion of the block on a flat surface to obtain the most accurate measurement of the inside
diameter.

Measure the inside diameter in the three positions shown.
The inside diameter must be completely round within 0.0190 mm [0.00075-inch].

 

 

02. March 2021 by samuel
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Cummins N14 – Cylinder Block – Cleaning and Inspection – Camshaft Bore – Inspection

Measure the cylinder block camshaft bore inside diameter.

If the bore inside diameter is not within specifications, the bore must be repaired. Refer to the Alternate Repair
Manual, Bulletin No. 3379035.

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Cummins N14 – Cylinder Block – Cleaning and Inspection – Camshaft Bore – Cleaning

Use a fine emery cloth to remove burrs, and clean the bushing bores.

 

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Cummins N14 – Cylinder Block – Cleaning and Inspection – Cylinder Block – Cleaning

Caution: Do not damage the machined gasket surfaces or the camshaft bushings if the bushings have not been
removed.
Use a gasket scraper, wire brush, or a fibrous abrasive pad such as Scotch-BriteT No. 7447, Part No. 3823258,
or its equivalent to clean heavy deposits off the cylinder block.

Clean the following cylinder block areas:
Cylinder liner counterbore ledge and press fit area.

Cylinder liner packing ring bore.

Cylinder head deck surface.

Main bearing saddles and caps.

Camshaft bore cup plug area.

All gasket surfaces.

All component mounting surfaces.

Clean all oil passages. Use a bottle brush with a long handle.

Warning: Use a face shield, rubber gloves, an apron, and boots and obey the warning label on the cleaning
solution used to prevent personal injury.
Caution: Use a cleaning solution that will not damage the camshaft bushings if the bushings have not been
removed.
Remove the block from the engine stand. Put the block in a cleaning tank.
Follow the instructions of the manufacturer of the cleaning tank and the manufacturer of the cleaning solution.
NOTE: Cummins Engine Company, Inc., does not recommend any specific cleaning solution.

The best results can be obtained by using a cleaning solution that can be heated to 80° C to 95° C [180 ° F to
200° F].
Use a cleaning tank that will mix and filter the cleaning solution to get the best results.

Warning: Use a face shield, rubber gloves, an apron, and boots and obey the warning label on the cleaning
solution used to prevent personal injury.
Remove the block from the cleaning tank.
Clean all the oil passages using a steam cleaner.
Caution: Make sure all the water is removed from the capscrew holes and the oil passages to prevent rust formation in the cylinder block.
Use compressed air to dry the block.

Warning: Naptha and methyl ethyl ketone (MEK) are flammable materials and must be used with care. Do not
use starting fluid as a cleaning agent. It can cause personal injury if ignited.
Clean the cylinder block counterbores with a suitable hydrocarbon solvent such as naptha, methyl ethyl ketone
(MEK), or trichlorethane 1, 1, 1 (methyl chloroform).

NOTE: If the cylinder block is not going to be used immediately, apply a coating of preservative oil to prevent rust.
Cover the block to prevent dirt from sticking to the oil.

01. March 2021 by samuel
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