1969 Chris Craft Roamer 46 Refit: Removing Unnecessary Cummins Parts

I got my Cummins 6CTAs installed over summer 2015 and need to wrap up the installation so I can splash the boat and bring it closer to home in 2016. One of the things I need to do is service the aftercoolers, and while I have them off I decided to eliminate some unnecessary electrical components–the intake air heater system and a noise suppressor that looks like it was installed as an afterthought.

A lot of the spaghetti in this pic comes from the air heaters

A lot of the spaghetti in this pic comes from the air heaters

The air heater solenoids and CPU

The air heater solenoids and CPU

Cummins engines don’t need the air heater to start. All they do is cut down on white smoke on cold starts. I installed 400w Moroso oil pan heaters when I put the engines in, so the air heaters have become a not very useful option. According to the gurus at boatdiesel.com, the air heaters are more trouble than they’re worth. Many work just fine, but a lot of them end up killing the alternator, and they can draw down battery voltage to the point that accessories stop working. There are some workarounds for those problems, but there’s another consideration in my install: in the pic above, you can see that the lower left solenoid is unbolted from its mounting plate and hanging there at an angle. I did that because otherwise the solenoid hits the stringer. You can also see that the electric terminals on the right-side solenoid are extremely close to my stringers, which are made of aluminum. By the size of the cables, it’s safe to assume that a lot of current can run through here. I don’t like having that much power that close to the conductive stringers. But I also didn’t want to cut the stringer to make clearance, and rearranging the solenoids or relocating the plate would take time. Given the recommendations over at boatdiesel.com, I’d rather just remove them and be done with it.

Remove bolts that attach the power cables to the grid heater

Remove bolts that attach the power cables to the grid heater

Remove cable from starter positive terminal

Remove cable from starter positive terminal

Track down wires that don't connect to anything

Track down wires that don’t connect to anything essential

Track down more wires that don't connect to anything

Track down more wires that don’t connect to anything, and one that connects to the bellhousing tach sender

Air heater system fuse

Adding wires here that connect to a switch at the helm can give manual control to people who want to keep their heaters.

Carefully extract the wires from the loom, and out it comes

Carefully extract the wires from the loom, and out it comes

Ah HAAA! A solenoid in the process of failing

Ah HAAA! A solenoid in the process of failing

The hole that’s been burned through the plastic housing of this solenoid was on the under-side…never would have seen it without removing the whole thing. This is the kind of stuff the guys at boatdiesel warn about. Good riddance, I say.

Noise suppressor comes off the alternator next

Noise suppressor (the little box with the wires going to it) comes off the alternator next

Useless electrical gear removed

Useless electrical gear removed from both engines

Much less spaghetti

Much less spaghetti

Next up in our 1969 Chris Craft Roamer 46 Refit: Servicing the Aftercoolers

Advertisements

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s