502 MPI Problem
 

Long time reader just join as most do when we have problems with that said here a little about me.
· Working at the same company for 37 yrs – Logistics supply chain services
· Live in Dallas area
· Age 59
· Have a 70 Cuda FC7 matching numbers
· 2013 HD with 2300 mile (for sale)

· And my problem toy, 1996 Advantage Victory 27 with 502 MPI (black motor) ser# 2000017 with VST tank system, MSD disty with MSD coil, had injectors cleaned (sonic cleaning) at time of valve job.

So here my issue: I bought this boat about 3 yrs ago, never seem to run right so had a shop do leak down test, found bad 2 valve guides bad. So we pulled the heads and had Kim Barr do a valve job. Seemed better but still not right. So I bought the Rinda scanner last week, hook up the scanner showed a knock sensor fault, new knock sensor clear the code out, Now it will run up over 4000 rpm but then oil started coming out the dipstick tube. This is after about 10hrs on the motor after the heads have been rebuilt. My plan is to do a compression check, then leak down, and use a scope to look in cylinders. I’m also going to change the oil and see what it looks like. So am I looking at blow by or can something else cause this I’m going to check all of the routing for the PVC system.

Regards,

PS: If I do find out its blow by rebuild or by a short block?

never seen the boat but I am local and surely can work on it. I would have to fit this in somehow as I am weeks out in repairs and the heat is a huge factor in DFW.

taking many breaks these days with this heat.

Your engine serial number posted is not close to being any form of a Mercruiser engine serial number Just a saying

Thanks BUP once I get these test done I may need to get with you, hope to do these test Thur-Friday in the 105 heat :)

Regards,

Could it be SER# OK200017 maybe an extra 0

zero K

0K for the first 2 engine serial number ---- yes I can run it to check on it. The VST a huge issue to keep that in the mix.

Whom did the injectors just seeing ?

Build sheets and any dyno reports ??

Our area not the greatest for high performance MARINE engine builds and machine work. Reyer and morrison good but they can careless about the one or two marine builds Just saying

Injectors where sent to someone in New Orleans area not sue who, no dyno report just flow report on the injectors. I keep the boat at Lake Texoma so Chad at Flowing Wells is the mechanic he removed the heads and re-stalled them. Also did a complete rebuild on the VST when I got the boat, fule pressue is good check that show no code after running it on Saturdat just oil coming out the dipstick tube, scanner shows temps good and everything within the correct readings.

https://www.offshoreonly.com/forums/...tick-tube.html.

crank case pressure to high ??

poor windage

poor oil control

oil whipping on and around the crankshaft

poor pvc and or crank venting or restrictions

So after compression check 4 cylinders are down 2 at 55-60, so looking for a motor I found this opinions welcome.
TRI STAR ENGINES & TRANSMISSIONS

PRO STAR™ MARINE 540 CID BIG BLOCK CHEVY CRATE ENGINE (COMPLETE & DYNO'D)
• Marine Build
• Dart™ Big M Block
• Dart™ Pro 1 Cylinder Heads
• 600 Horsepower
• 610 Torque
supplied with 2618 forged pistons, 4340 H-Beam rods and a Scat 4340 forged crank.
Dart™ Big M
290° Intake
296° Exhaust
237° Intake
243° Exhaust
.634 Intake
.640 Exhaust
Dart™ Pro 1 Cylinder head castings

Specs
►325cc Intake Runner
►121cc combustion chamber volume
►2.25 stainless intake valves
►1.88 stainless exhaust valves
►Rectangular intake port shape
►Howards HP valve springs
►Howards chrome moly valve spring retainer
•Dart aluminum heads are cast from virgin 355-T61 aerospace alloy for superior strength and integrity.
►Manganese bronze valve guides extend cylinder head life and reduce stem wear.
►Hardened exhaust seats are compatible with unleaded gasoline
►Multi-angle intake seats and radiused exhaust seats dramatically increase airflow.
►Spark plug holes are machined for gasketed 3/4" reach plugs.
►Heart shaped 121cc chambers improve combustion efficiency.
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►Exhaust ports raised .300" to improve flow
• Dyno Tested
Online price:
$11,995.00