Merc 575 540ci questions
 

I am looking at a merc 575 540 ci motor, I am not sure of the year, but assume 80's.

I am looking for the specs on this motor and any pictures and information possible.
Like reliability and real hp.

Thanks for any help

This might work better if you give me an old style fax number, I will try to attach a file to this post.

Did not work.

Here are some specs for the 1988 Mercruiser 575

HP 575@5000

540 CI

Bore 4.440

Stroke 4.375

compression ratio 8.75:1

Fuel 88 octane

Crank, L.A. Enterprises

Block, Iron, Siameses bores

Rods, Carillo

Pistons, Forged

Heads, GM iron rectangle port

Valves, intake Stainless steel
Exhaust, Inconel

Cam, Crane solid lifter flat tappet

Rocker arms, Crane rollers

Intake, Weiand single plane

Carb, Holley 1050 Dominator

Exhaust, Stelling tubular stainless headers

Fuel pump, Carter Hi Performance

Oil pump GM Hi Perf.

Ignition Mercruiser Thunderbolt IV

Sterndive options were Speedmaster III or IV

Here a pic

Damn you guys rock.
Thanks for the rapid response.

Any idea, on the life span?

Thanks again.


RT

Biggus,
The Merc part # for that cam is 12475. Do you have the Crane #?
Thanks,
Bob

Sorry RM, I do not .

Lifespan=Short

I am assuming cam?

Here is some more of what I had...

http://www.cranecams.com/master/apps....%20Mechanical

That is the link for the cam part number


RT

Thanks RT,
Bob

My first 41 Apache had those motors. Lot's of problems with broken rocker arms (bad batch from GM, they said). Burned some oil from the beginning, but no major problems once the rocker arms were replaced.

I had C&G rebuild them after the first summer to 650's (cam and heads). Then the transmissions had continuing problems (Speedmaster 3's).

Firewalker, here's something to consider...

Just remember that the Merc 540"/575hp engine has a mechanical cam as mentioned above----that means maintenance---periodic valve train adjustments. Which isn't always the best way to go these days. You could always add a hydaulic roller cam which will eliminate the need for pain in the arse valve train adjustments and be much better off-------that is of course unless you enjoy or DON'T mind doing maintenance on the valve train.

Have 2 of those in my boat, no problems after first season. I changed cam to a hydraulic roller, crane 139651 and it works great.

Some additional info:

Pistons, JE
Block, Bowtie
Crank, also Hank the Crank
Produced 1986-1992

If you want photos or any other info please mail me at [email protected]

Have a nice day!
/Torbjorn

My friend just bought a Top Gun -87, the boat is in mint condition and havn´t been run the last 5-6 years. We fired the engines and everything spun well, but for now I woundering how long is the service interval for the vale train adjustment?

Hi Biggus.
Do you have the pic in better quality please? Incl. Outdrives?

Thanks