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  #31  
Old 09-05-2018, 01:12 AM
lake weir skier lake weir skier is offline
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Boat: 1994 MasterCraft ProStar 190, 350 TBI, 1:1
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Originally Posted by JimN View Post
Compression, leakdown and vacuum are the indicators for determining the health of an engine and thatís why seeing the MAP sensorís reading under load is so important. Testing the sensor is fine, but it would be good to know how it compares to a new one.
I'll be getting the output voltage for the MAP sensor under load at the same time as I measure the fuel pressure at various RPM levels under load. I'm also investigating the prop shaft alignment, cutlass bearing, etc.

For the test of the MAP sensor itself, I posted the actual output voltages and two links to reference voltages in Post #11.
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  #32  
Old 09-05-2018, 09:52 AM
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JimN JimN is offline
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Quote:
Originally Posted by lake weir skier View Post
I'll be getting the output voltage for the MAP sensor under load at the same time as I measure the fuel pressure at various RPM levels under load. I'm also investigating the prop shaft alignment, cutlass bearing, etc.

For the test of the MAP sensor itself, I posted the actual output voltages and two links to reference voltages in Post #11.
Getting output voltage is great if youíre testing the sensor but thatís not testing the engine and thatís what is needed, as you plan to do. It will be easier with a second person, as the driver. Remove the engine cover- itís a roysl PITA to do this with it in place.
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  #33  
Old 09-05-2018, 12:57 PM
lake weir skier lake weir skier is offline
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Boat: 1994 MasterCraft ProStar 190, 350 TBI, 1:1
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I've been reading TT threads related to alignment and reviewing other sources too. I don't know much of the pre-2013 history of my 1994 boat, but it appears without disassembly yet that the cutlass bearing has a black inner surface, so I guess that is rubber and not Vesconite. Wonder if it's ever been changed. The boat has about 510 hours. With the boat out of the water for a couple of weeks, I can get the prop to turn with one finger but with great difficulty, so it seems to spin with more difficulty than I've seen with some others online.

As I mentioned to JimN in PM, about a year or so ago, I accidentally ran the prop at pretty high RPM in the driveway for about 10-15 seconds without water on the cutlass bearing. Not sure if that harmed anything. We'll see.

As stated above, I intend to take a closer look at all aspects of the alignment, but wanted to say what I've noticed so far.

I'm researching it more, but I've noticed so far runout measurement being performed on either side of the strut with the strut and shaft installed, and my Clymer manual discusses runout measurement with the shaft removed and sitting on two V-blocks. I'm working on sourcing an electronic or dial indicator.
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  #34  
Old 09-08-2018, 08:38 PM
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mikeg205 mikeg205 is offline
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Boat: 1995 Pro Star 205 5.7 Liter
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Lake w. Have you inspected your fuel pump inlet screen? Is your fuel pickup air tight? How old are your fuel linew.

Fuel pressure can he spot on but volume may be reduced. Pic shows what mine looked like.. after clean up and new return line was able to get 4600-4700 rpm. No dog house and just one in the boat.

Even with all that crud my fuel pressure was spot on but only could get 3200 rpm wot.



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  #35  
Old 09-09-2018, 02:48 PM
lake weir skier lake weir skier is offline
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Quote:
Originally Posted by mikeg205 View Post
Lake w. Have you inspected your fuel pump inlet screen? Is your fuel pickup air tight? How old are your fuel linew.

Fuel pressure can he spot on but volume may be reduced. Pic shows what mine looked like.. after clean up and new return line was able to get 4600-4700 rpm. No dog house and just one in the boat.

Even with all that crud my fuel pressure was spot on but only could get 3200 rpm wot.



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I've checked some of those things in past years and have them on the list to check again. Wish I could get those RPMs.
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  #36  
Old 09-09-2018, 05:24 PM
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mikeg205 mikeg205 is offline
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Did u ever change fuel lines?... the fuel gets warm and hoses soften... the marine lines have a non collapable core.


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  #37  
Old 09-09-2018, 11:20 PM
lake weir skier lake weir skier is offline
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Originally Posted by mikeg205 View Post
Did u ever change fuel lines?... the fuel gets warm and hoses soften... the marine lines have a non collapable core.


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Nope, but I've only owned the boat since 2013. How do I tell if the fuel hoses are original?
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  #38  
Old 09-09-2018, 11:30 PM
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mikeg205 mikeg205 is offline
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The manufacture year will by printed on them and they will be gray.

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