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#525094 - 12/03/11 04:17 PM Mercruiser 7.4L Rebuild - All Done . . . .
tpenfield Offline
Admiral

Registered: 08/29/05
Posts: 2017
Loc: Cape Cod, MA
I finished things up with the engine today, so here is a picture (or 2) of the engine in its final form. cool





My next steps are to get the engine primed with oil and set things up to do some bench testing and various adjustments. Then I may as well put it back in the boat, so I can have the garage back for winter. thumb
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#525097 - 12/03/11 07:33 PM Re: Mercruiser 7.4L Rebuild - All Done . . . . [Re: tpenfield]
GoFirstClass Offline
Retired Boating Bum
Grand Poobah

Registered: 11/21/03
Posts: 13466
Loc: Pasco, WA
Nicely done. That looks like a brand spankin' new engine. I bet you're anxious to fire it for the first time!
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#525106 - 12/03/11 08:27 PM Re: Mercruiser 7.4L Rebuild - All Done . . . . [Re: tpenfield]
kdl Offline
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Registered: 04/16/06
Posts: 2404
Loc: Central Mass
thumb
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#525108 - 12/04/11 07:04 AM Re: Mercruiser 7.4L Rebuild - All Done . . . . [Re: tpenfield]
Lou C Offline
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Registered: 01/20/03
Posts: 1426
Loc: Long Island NY
great job!!!
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98 Jeep Grand Cherokee 4.0 Six Selectrac
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#525122 - 12/04/11 03:55 PM Re: Mercruiser 7.4L Rebuild - All Done . . . . [Re: tpenfield]
Dave R Offline
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Registered: 07/30/03
Posts: 6167
Loc: Raymond NH
Nice work, I'm sure it'll run perfectly.
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#525125 - 12/04/11 04:39 PM Mercruiser 7.4L - Startup Video [Re: tpenfield]
tpenfield Offline
Admiral

Registered: 08/29/05
Posts: 2017
Loc: Cape Cod, MA
A good day in getting the engine set up on some dollies and hooking it up for a test run.

Here is a video of starting it up on my web page . . .

Test Run of Mercruiser 7.4L

I also uploaded it to YouTube . . .



Edited by tpenfield (12/04/11 04:56 PM)
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#525126 - 12/04/11 04:45 PM Re: Mercruiser 7.4L - Startup Video [Re: tpenfield]
Lou C Offline
Admiral

Registered: 01/20/03
Posts: 1426
Loc: Long Island NY
Loved watching it Ted, great job, I especially liked the dual dollies to move the engine around...sounds like its running really smoothly....
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88 Four Winns 200 Horizon 4.3 OMC
98 Jeep Grand Cherokee 4.0 Six Selectrac
07 Jeep Grand Cherokee 5.7 HEMI Quadradrive II

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#525128 - 12/04/11 06:24 PM Re: Mercruiser 7.4L - Startup Video [Re: tpenfield]
Puddle Pirate 2 Offline
LTJG USCGR
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Registered: 03/25/04
Posts: 4162
Loc: Eastern PA
WOW...that fired right up. Nice job! So, my takeaway was that your problem was probably mostly attributable to the rust scale and to a lesser extent, the valves being a little goofy. Sound about right?
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#525130 - 12/04/11 06:30 PM Re: Mercruiser 7.4L - Startup Video [Re: Puddle Pirate 2]
tpenfield Offline
Admiral

Registered: 08/29/05
Posts: 2017
Loc: Cape Cod, MA
Originally Posted By: Puddle Pirate 2
WOW...that fired right up. Nice job! So, my takeaway was that your problem was probably mostly attributable to the rust scale and to a lesser extent, the valves being a little goofy. Sound about right?


Yes, I think that the rust sediment in the block was causing the engine to run hot, and the valve leakage was losing power. We shall see how it performs once in the boat and on the water.
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Formula 330SS

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#525132 - 12/04/11 07:19 PM Re: Mercruiser 7.4L - Startup Video [Re: tpenfield]
kdl Offline
Admiral

Registered: 04/16/06
Posts: 2404
Loc: Central Mass
Originally Posted By: tpenfield

We shall see how it performs once in the boat and on the water.



Well, what are we waiting for??? You've got five days before the temperature really drops off. wink

Does sound good running.
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2001 Key Largo 190 CC
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#525135 - 12/04/11 09:24 PM Re: Mercruiser 7.4L - Startup Video [Re: kdl]
CharlesS Offline
Admiral

Registered: 06/10/10
Posts: 1964
Loc: Bryson City, NC. 28713
Wow Ted, you have done a first class job!

Love to read the stats and look at the pics when you run the boat for the first time.
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#525141 - 12/05/11 05:30 AM Re: Mercruiser 7.4L - Startup Video [Re: tpenfield]
BToran Offline
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Registered: 08/06/05
Posts: 4737
Loc: Northport, New York
sweet.
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1996 Carver 320 Voyager
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#525147 - 12/05/11 08:16 AM Re: Mercruiser 7.4L - Startup Video [Re: tpenfield]
Dave R Offline
Admiral

Registered: 07/30/03
Posts: 6167
Loc: Raymond NH
Sounds great! I love starting a motor up after it's been all apart and I put it back together. It's so rewarding, even if it's a lawnmower engine, more so if it's a big V8 though.

My last enginbe tear-down was earlier this year when I replaced a head gasket and cylinder base gasket on my 2001 Kawasaki ZX9R. I have to confess that after it was together, I turned the key on, stabbed the starter button, and the motor did nothing. I double checked my wiring harness connections, checked fuses, and basically wasted an hour troubleshooting. Only then did I notice it was in gear... I put it in neutral and it fired right up. Doh!

The only good thing that came out of this was that I discovered my fuel pump was getting very loud (a sign of imminent failure). It only runs after the starter button has been pressed, so I never heard it running over the noise of the engine before. I replaced it with a low-mile used one and carry the old one as a spare. They are very easy to change and will strand you if they fail.
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#525267 - 12/07/11 10:06 PM Re: Mercruiser 7.4L - Startup Video [Re: tpenfield]
Justified Too Offline
Admiral

Registered: 02/06/06
Posts: 1138
Loc: Colorado
LOVE that sound! smile
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'Justified Too' - 2003 Chaparral 220 SSI 350 MAG/MPI BIII

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#525459 - 12/13/11 10:29 AM Re: Mercruiser 7.4L - Startup Video [Re: tpenfield]
DaleG Offline
Admiral

Registered: 03/23/06
Posts: 661
Loc: West Palm Beach FL
Nice rebuild --- I really liked removing my 5.7L and similar rebuild work last winter --- I need to start thinking about the electrical rewiring project for this winter.
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Dale Gange - West Palm Beach
Wow - its been 40 plus years since I was an Ensign -USNA 1970

2003 Four Winns 240 Horizon
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