Official Cummins 6cta 450C thread

[Forrestkk]

How did you bump for top dead center… I know the rest just don’t know how to rotate heard a few different things ?

Used the alternator pulley to bar over the engine.

 

[Irie308]

Looking to buy a few of these without purchasing the whole kit. Does anyone where I can get 1-2 off similar size in this kit?
https://www.sbmar.com/product/qsb-5-9-complete-hose-clamp-kit

 

[Irie308]

Any issue with using a stainless steel fitting in the old grid heater sensor port? I’m hooking up a non Sbar marine boost sensor and I need a 90 degree 90° elbow, 1/2" Male x 1/4" NPTF Female but can only find it in 304 stainless.

 

[Woody]

Looking to buy a few of these without purchasing the whole kit. Does anyone where I can get 1-2 off similar size in this kit?
https://www.sbmar.com/product/qsb-5-9-complete-hose-clamp-kit

Just google constant torque hose clamps, lots of places to buy them. I use Breeze brand.

 

[Irie308]

Just google constant torque hose clamps, lots of places to buy them. I use Breeze brand.

Thanks, didn’t know what they were called.

 

[Woody]

Thanks, didn’t know what they were called.

This is the type you looking for right?

 

[Irie308]

This is the type you looking for right?
View attachment 121078

Yes

 

[ZZ13]

Any issue with using a stainless steel fitting in the old grid heater sensor port? I’m hooking up a non Sbar marine boost sensor and I need a 90 degree 90° elbow, 1/2" Male x 1/4" NPTF Female but can only find it in 304 stainless.

I put a brass plug in mine. I can’t imagine any issue with stainless into the steel port.

 

[ZZ13]

A couple of 450 Diamonds being painted at our local boat yard today. They were removed to make room to replace the fuel tanks on a Sealine.

 

[Art]

My port 480CE engine overheated and needs to be rebuilt. The boat is in Boca Raton, looking for mechanic recommendations. Can this job be done in the 450 engine room?

Art

 

[boaterholic]

My port 480CE engine overheated and needs to be rebuilt. The boat is in Boca Raton, looking for mechanic recommendations. Can this job be done in the 450 engine room?

Art

Billy Donnelly, (561) 401-2109

He’s mobile and out of your area. He did some major work on a Sea Ray with Cummins that was across dock from me at a marina in Jax. Also did engine survey on a buddy’s Sea Ray.

 

[Forrestkk]

My port 480CE engine overheated and needs to be rebuilt. The boat is in Boca Raton, looking for mechanic recommendations. Can this job be done in the 450 engine room?

Art

Art, sorry to hear that.

Hard to tell if it can be done in the ER. With an overheat, it is hard to tell the condition of the block without magnafluxing it at a machine shop. If the block cracked anywhere and you do an "in-frame" overhaul could end up with another overhaul soon to follow.

How hot did it get?

 

[scooper321]

Looking at SBMAR’s website, it looks like this engine takes 30.5 quarts of coolant (when a heat exchanger is used). Is that accurate? Going on year 4 with this boat and thinking it’s time for a coolant change this year...

 

[Forrestkk]

Looking at SBMAR’s website, it looks like this engine takes 30.5 quarts of coolant (when a heat exchanger is used). Is that accurate? Going on year 4 with this boat and thinking it’s time for a coolant change this year...

Yes, just did my port engine's t-stats. That is an accurate number.

 

[Art]

Art, sorry to hear that.

Hard to tell if it can be done in the ER. With an overheat, it is hard to tell the condition of the block without magnafluxing it at a machine shop. If the block cracked anywhere and you do an "in-frame" overhaul could end up with another overhaul soon to follow.

How hot did it get?

Approx. 165 - 170. Shutdown as soon as alarm went off.

 

[Forrestkk]

Approx. 165 - 170. Shutdown as soon as alarm went off.

165F to 170F is normal temp. Our T-stats are either 160F or 180F. I think the alarm sounds at 200F.

Did you just get a false alarm from a bad over temp switch? Happened to me with bad low oil pressure switch.

 

[Art]

Originally thought the problem was a coolant hose, but leak was in the Turbo. Further investigation found a crack in the exhaust manifold and head.

 

[ZZ13]

Looking at SBMAR’s website, it looks like this engine takes 30.5 quarts of coolant (when a heat exchanger is used). Is that accurate? Going on year 4 with this boat and thinking it’s time for a coolant change this year...

That’s about what I found. Plus whatever you put into the overflow jug.

http://www.clubsearay.com/index.php...s-6cta-450c-thread.77886/page-27#post-1097898

 

[Forrestkk]

Originally thought the problem was a coolant hose, but leak was in the Turbo. Further investigation found a crack in the exhaust manifold and head.

Yikes. Did coolant get into the oil?

 

[Art]

Yes, there is coolant intrusion but the boat sat for a long time between the incident and the discovery. The coolant might have drained in. I've been distracted and in California and trying to deal with this long distance due to my daughter's health problems. It's a real s....show!!