D 353 marine engine information

I show two settings for units with jacket water pump, jacket after cooler water system and cast water cooled exhaust manifolds. This is for s/n 47B1780 - 2463
No. 1 settings are:
Full load rpm = 1225 +/- 10 rpm
High idle rpm = 1310 +/- 30 rpm
Horse power = 330
Rack setting = 0.060"
Manifold pressure = 27" Hg (full load)

No. 2 settings are:
Full load rpm = 1200 +/- 10 rpm
High idle rpm = 1290 +/- 30 rpm
Horse power = 330
Rack setting 0.070"
Manifold pressure = 28"Hg (full load)

Low idle rpm = 475 +/- 10 rpm
Lifter setting 2.0899 +/- 0.002"

Any change in engine configuration from the above affects engine hp.

Do you have any idea about which color governor spring should be used? Right now it has the green one. I don’t know the part number.

I used the tool to measure the rack dimension, it starts with a 7h, I can’t remeber the full part number but I got a .245 reading.

Green spring is a 9F7651 and is standard for all the shown configurations for those s/n"s. There is quite a variety of rack settings up to 0.255" (set with the 3H1690 gauge) for engine with dry manifold or water shielded manifold and rated at 455 hp. 0.245" is not one of the options. I wonder if someone has tampered with the settings.

Hi Team,
if the engines, as you say are not running well--do you mean run roughly or low on power ?
For engines running rough and harder than when newer to start may require the Lifter Settings Checked to ensure the injection timing is still correct.
The injection pump drive shafts had a tang and slot drive coupling that can wear or even fracture, especially with the higher horsepower setting applications --from memory later couplings had a sleeve shrink fitted to them to stop the breakage or yours may already have them fitted-- I stand to be corrected.

For the Factory Rack Settings and engine Consist list of parts from when the engines were built there should be an Engine Bill Of Materials Number on a plate on the Fuel Filter housing--depending on S/No range and filter fitted--this from memory-- that you will need to get The Dealer to check for you to supply the data you ask of.

Further to the lifter setting dimension OM gave it is done with the pistons at TDC on compression stroke for the cylinder being adjusted--first check that the flywheel TDC mark for the relevant cylinder is correct as some engines did not have an offset flywheel bolt that prevented installing the flywheel incorrectly and so causing the TDC marks to be incorrectly located--usually happens when the unknowing fit a flywheel after overhaul--there are 2 factory chisel marks --one on the flywheel hub and one on the crank flange to get it correct with out the offset bolt.
Hope this helps.
Cheers,
Eddie B.

Green spring is a 9F7651 and is standard for all the shown configurations for those s/n"s. There is quite a variety of rack settings up to 0.255" (set with the 3H1690 gauge) for engine with dry manifold or water shielded manifold and rated at 455 hp. 0.245" is not one of the options. I wonder if someone has tampered with the settings.

Any history of prop changes?

Not that I know if. I’ve olny been here for two years, trying to get everything running right and on a proper maintenance schedule.

Was able to find a tag buried under paint. Guess I should have looked harder.

D 353 6 cyl 6.25 bore 8 stroke
Serial 47B2020
High idle 1335
Full load 1225
Rack setting .180
Hp setting at sea level 425
BOM 40285