Cat 3208 Question

See what it turns up in neutral. That will tell you if it's governed. I'm not familiar with the boat but if it's a planing hull you need to run it in deep water with a full load of fuel to see where you are with the props. If the tachs are accurate it sounds like you need to take an inch of pitch out to pick up approx. 200 rpm. What size props were on the boat when it was new?

Some owners (like me) take 2-250 rpm of the top in order to preserve wear on the mains and prefer to run at that top rpm, however if the boat is not performing and needs the extra rpm, then yes, fix it.worth checking first before changing props etc.

get a mechanical survey, it will be money well spent.

you will want the boat to reach max RMP at WOT under load....
a no load test will confirm that your gov's are properly set.

if not getting max rmp at wot under load you can substantially shorten the life of a diesel.

You may have just have to take some pitch out of the props. It could be that simple. A clean bottom and fresh scanned props will help you get an accurate

An engine survey by a qualified CAT tech shouldnt cost more than a few hundred dollars for a pair of 3208s.

Also, oil analysis can be a helpful look into the life and condition of an engine, but sometimes hours on oil is not accurate. Oil analysis is best if you have a documented history of the samples and hours on oil along with fuel through the engines.

RER,

i agree you are correct in your cost estimate.

worth every penny....

RT46


I also recommend that the buyer be present for the hull and system survey.

I like to observe and ask questions along the way.
Some surveyors might not like this, but if i am paying them, I want to be there to gain knowledge and awareness and ask questions....

Plus the spoken word is often more descriptive than a written report.

RER,

you on right on point.

RT46

Be careful

I have 3208 TA's 375 HP in a 38' Ocean Yacht. In neutral they should spin up to 3000 RPM. FULLY loaded [fuel water gear and people ] you should go a little over 2800 RPM with a clean bottom and no opposing wind or current. If necessary do an average of a two way run.

When you say Glycol inn the port engine you mean "real " glycol ? wow....there goes a set of bearings.....

Depending on how much glycol, a little bit won't wash the bearings. Or a lot of glycol for a very brief period of time, and I mean very brief.

I manage a sistership to the one you're looking to buy. It's a well built boat and roomy for it's size. The engines in the boat I manage were only supposed to go 2600 rpm's top end, not 2800 rpms. Check the serial numbers against what CAT recommends, but it's not uncommon to have to remove a little bit of pitch on a boat of that age. Also, depending, I've peeled all of the layers of bottom paint on a boat of that age and gained 100rpms. There's a lot of weight in all of the layers of bottom paint that build up as well as the surface isn't as true.

A little more info

My transmissions have a 1.5 to 1 gear ratio. I have been running 22x21x4 blades with a light cup, that now after 10 years only make 2700 RPM.
The diamater is in part a factor of the tip clearence to the hull. You may also have a higher gear ratio than I.
I also have a set of 22x24x3 blades that were the original spec from Ocean Yacht but now they only spin to 2650 RPM. Both sets are in the shop at this time.
Call your local Cat dealer with the engine S/N's like the previous poster suggested to make sure what they should spin up to.
Over propping will shorten the life of your engines and does not save on fuel like some people think. It raises the combustion temps which is detremental to engine life.

depending on how long the head gasket has been leaking...the bearings may be still ok.....any other metals high in the oil?

If the owner makes repairs on the head gasket, then I would want full receipts and documents from a qualified CAT guy. ask for tranferrable warranty.

Sometimes you are better getting allowances and having the repairs done yourself.

also, you really need to know exactly which 3208 you have in there, i suspect WOT will be different for the N/As vs the Ts, vs the TAs and whatever other variation was available for the 3208s

You make a good point.

I would recomend you do not change the props until the engine repair is compleated and the boat sea trialed again to see what they spin up to.

I second this as well.