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Forum: Engines and Propulsion Systems

28-06-2017, 06:56

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

That the engine runs smooth and strong is a reason for cautious optimism.

Don't worry about running the engine in neutral up to full RPM, which in your case would be either 3600, or 4000 if you...

Forum: Engines and Propulsion Systems

26-06-2017, 17:38

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

Would have been nice to have just advised from the beginning that there are holes evenly spaced around the circumference, as was queried in post 63, highlighted in red above. If Joe's HE bundle is...

Forum: Engines and Propulsion Systems

25-06-2017, 00:50

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

So what you're saying is that the tube bundle you have is not like the one illustrated in these two pictures

https://www.cruisersforum.com/forums/attachment.php?attachmentid=150569&d=1498343481
...

Forum: Engines and Propulsion Systems

24-06-2017, 17:13

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

The bundle is identical in design and function. it is not identical in dimensions.

If there is no bleed hole in the what-I'm-calling upper side of the bundle, and it is turned so the two large...

Forum: Engines and Propulsion Systems

22-06-2017, 04:45

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

The freshwater goes through the big holes. The seawater goes through the small tubes in the bundle. The air pocket would be in the freshwater side of the HE bundle (possibly) trapped by gravity by...

Forum: Engines and Propulsion Systems

22-06-2017, 04:14

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

Nowhere in the attachment you provide from Bowman does it say 'the heat exchanger must be assembled correctly to work as designed', possibly because that is self evident.

The statements yellowed...

Forum: Engines and Propulsion Systems

20-06-2017, 16:47

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

Joe,

If the tube bundle pictured below is the one you have, and it is not oriented with the large hole up as shown in the picture, it is possible for the orientation of the tube bundle to cause...

Forum: Engines and Propulsion Systems

19-06-2017, 21:53

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

Sorry for the clumsy wording, the 'air' is, of course, not boiling. The interface of the freshwater at the hotspot the trapped air is creating is where the boiling would take place...

Forum: Engines and Propulsion Systems

19-06-2017, 20:54

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

First things first.

Go back and check the alignment of the heat exchanger bundle within the manifold. I'm betting that the large holes in the bundle are not aligned with the corresponding holes in...

Forum: Engines and Propulsion Systems

14-06-2017, 02:23

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

https://www.cruisersforum.com/forums/attachment.php?attachmentid=149650&stc=1&thumb=1&d=1497035669 (https://www.cruisersforum.com/forums/attachment.php?attachmentid=149650&d=1497035669)

Now we have...

Forum: Engines and Propulsion Systems

04-06-2017, 10:25

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

If we're talking about the F/W circulation pump I agree. Not so sure about the raw water pump, but that is a positive displacement pump and could well pump at 17 psi+. Not to say that that is the...

Forum: Engines and Propulsion Systems

03-06-2017, 14:51

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

There are two numbers relating to prop size; diameter and pitch. Without both, either number is essentially meaningless.

You can (generally) check if your prop is causing an overheating problem...

Forum: Engines and Propulsion Systems

03-06-2017, 07:46

Replies: 85

New Engine - Same 4.107 over heating problem.

Views: 12,888

Posted By jimbunyard

Re: New Engine - Same 4.107 over heating problem.

Does the engine achieve max rpm in neutral?

The video doesn't play for me (not available).

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