Engine/Transmission (1998.5 - 2002) pistons???

[dodgediesel91]

i have an so 24v and im rebuilding it truck has a 6spd in it i thinking of putting ho pistons in it, is this a bad or a good thing so far i herd it was a good idea my list of mods is bellow and also does anyone have the cummins part # for the ho pistons, thanks guy Oo.

 

[ata]

You will have to change the piston oil cooling jets in the block to go along with the HO pistons.

 

[dodgediesel91]

Why , wats different with them I have to get new ones anyhow broke one.

 

[CAPTPHIL]

If your truck came with the NV5600 when it was new, it is an HO. The only offered the HO and NV5600 as a package. The HO engine has a 17 to 1 compression, the standard is 16. 5 to 1.
Good Luck

 

[dodgediesel91]

i myself put the 6 spd in myself truck use to be an auto so it is an so

 

[dodgediesel91]

so is all i shud have todo is actually change the cooling nozels and the pistons , right?

 

[ata]

The cooling jet in the SO just spray oil on the bottom of the piston. The HO jets are J shaped jets that shot an oil stream into an oil galley opening in the piston. You should get a manual and look up piston grading also.

 

[dodgediesel91]

Piston grading ? Whats that

 

[NIsaacs]

It might be a good idea to just get a CPL# from an HO truck and build the engine to that spec.



PS: My '01 HO CPL# is 2415



Nick

 

[Vaughn MacKenzie]

There is no difference between the SO and HO piston cooling setup, you can put HO pistons in no problem. The gallery cooling of the piston crown came later with the Common rail motors.

 

[dodgediesel91]

what is the cpl# wat does that mean and i found pistons in grade a, b, and c is a a better grade or made different or are the gradings for different uses?????

 

[chipster]

what is the cpl# wat does that mean and i found pistons in grade a, b, and c is a a better grade or made different or are the gradings for different uses?????

the a, b, c, grade on the pistons mean that each one is a little larger than the std piston. a is 1 or2 thousands larger than std, b is 1 or 2 thou larger than a, c is 1 or 2 thou larger than b . I do not know how many grades of pistons cummins uses. they use them if the cylinder is smooth, round and within the taper tolerance, and the cyl just needs honeing. the proper cyl to piston clearance can usually be made up using the proper grade piston. if the cyl is not in spec for out of round, taper, and finish, for a grade a, b, c, piston, the cyl must be bored and honed to fit the next oversize piston. now you know the REST of the story !!:-laf

 

[Bob4x4]

the a, b, c, grade on the pistons mean that each one is a little larger than the std piston. a is 1 or2 thousands larger than std, b is 1 or 2 thou larger than a, c is 1 or 2 thou larger than b . I do not know how many grades of pistons cummins uses. they use them if the cylinder is smooth, round and within the taper tolerance, and the cyl just needs honeing. the proper cyl to piston clearance can usually be made up using the proper grade piston. if the cyl is not in spec for out of round, taper, and finish, for a grade a, b, c, piston, the cyl must be bored and honed to fit the next oversize piston. now you know the REST of the story !!:-laf

Piston grading on 02 ctd's refers to piston protruding

Above the deck

A is . 609-. 711 mm

B is. . 508-. 609 mm

C is . 406- . 508 mm

These #s are for col 6050 and 6153

Other cols will be slightly different

 

[dodgediesel91]

so a,b,c is the proyruding above the deck or three difference sizes and how do i kno which to get

 

[chipster]

Piston grading on 02 ctd's refers to piston protruding

Above the deck

A is . 609-. 711 mm

B is. . 508-. 609 mm

C is . 406- . 508 mm

These #s are for col 6050 and 6153

Other cols will be slightly different

this is the first time I`ve heard of this type of piston grading. I try to learn something every day, and i just did. thanks for the up-grade to my knowledge bank !!

 

[dodgediesel91]

Thanks alot guys youve been alot of help now if my so pistons are grade b does that mean if i wana switch to ho pistons i shud get grade b in those to keep it right?

 

[dodgediesel91]

thanks alot guys so if my so pistons are grade b and i wana put ho pistons in i shud use grade b alos right?

 

[Bob4x4]

so a,b,c is the proyruding above the deck or three difference sizes and how do i kno which to get

Measure the piston protrusion above the head deck to choose the correct grade. Couldn't tell you if they are still selling graded pistons. The oversizes have always been listed as that (oversize) in mm

 

[Bob4x4]

STANDARD PROCEDURE—PISTON GRADING

When rebuilding an engine with the original cylinder block, crankshaft and pistons, make sure the pistons are installed in their original cylinder.

If replacing the piston(s), make sure the replacement piston(s) are the same grade as the one being replaced.

If a new cylinder block and/or crankshaft is used, the piston grading procedure MUST be performed to determine the proper piston grade for each cylinder.

Install any of the original connecting rod and piston assemblies into the No. 1 cylinder. DO NOT install the piston rings.

Install the upper bearing shell in the connecting rod with the tang of the bearing in the slot of the connecting rod. The connecting rod bearing shell must be installed in the original connecting rod and cap. Use clean lubricating oil to coat the inside diameter of the connecting rod bearing shell.

Install the bearing shell in the connecting rod cap with the tang of the bearing in the slot to the cap. Use clean lubricating oil to coat the inside diameter of the bearing shell.

The four digit number stamped on the connecting rod and cap at the parting line must match and be installed on the oil cooler side of the engine. Install the connecting rod cap and cap screws. Tighten the cap screws to 35 N·m (26 ft. lbs. ) torque.

Use a fine grit stone to remove any burrs from the cylinder block head deck. Zero the dial indicator to the cylinder block head deck.

Move the dial indicator directly over the piston pin to eliminate any side-to-side movement.

Rotate the crankshaft to top dead center (TDC). Rotate the crankshaft clockwise and counterclockwise to find the highest dial indicator reading. Record the reading.

Remove the piston and connecting rod assembly from the No. 1 cylinder and install the assembly into the No. 2 cylinder. Repeat the procedure for every cylinder using the same piston and connecting rod assembly.

Determine the grade of the piston being used by referring to the Piston Protrusion Chart below. Four digits on top of the piston can be cross referenced to a DaimlerChrysler part number for replacement (Piston Grading Number Location). If the number on the piston cannot be seen, measure from the top of the piston to the top of the piston pin to see what grade piston is used (Piston Grading Measurement).

NOTE: NEVER INTERMIX PISTONS FROM ONE ENGINE APPLICATION TO ANOTHER ENGINE APPLICATION. SEVER DRIVEABILITY CONCERNS MAY RESULT.



PISTON PROTRUSION CHART IF MEASURING PISTON IS AND USE



GRADING #: PROTRUSION IS GRADE:

245 HP 235 HP

6050 6153 0. 609-0. 711 mm A

(0. 024-0. 028 in. )

6050 6153 0. 508-0. 609mm B

(0. 020-0. 024 in. )

6050 6153 0. 406-0. 508 mm C

(0. 016-0. 020 in. )

6051 6154 0. 711-0. 813 mm A

(0. 028-0. 032 in. )

6051 6154 0. 609-0. 711 mm B

(0. 024-0. 028 in. )

6051 6154 0. 508-0. 609 mm C

(0. 020-0. 024 in. )

6052 6155 0. 813-0. 914 mm A

(0. 032-0. 036 in. )

6052 6155 0. 711-0. 813 mm B

(0. 028-0. 032 in. )

6052 6155 0. 609-0. 711 mm C

(0. 024-0. 028 in. )





NOTE: Use the table below when piston grading numbers are missing or not legible.



ALTERNATIVE GRADE IDENTIFICATION METHOD DIMENSION "A" REF. NUMBER GRADE

235 HP 245 HP

51. 554-51. 607 mm 6153 6050 A

(2. 029-2. 031 in. )

51. 654-51. 707 mm 6154 6051 B

(2. 033-2. 035 in. )

51. 754-51. 807 mm 6155 6052 C

(2. 037-2. 039 in. )

 

[ata]

Look on the bottom of the pistons you have. They should have the grading letter stamped on the flat of the bottom of the wrist pin. Just use the same letter for the same hole. (they probably will not all have the same letter)