mercruiser 454 compression test|Mercruiser 7.4L compression test after valve job : mfg The spec for 454 compression is lower than for small block 6 and cylinder engines. Around 130-140 for a healthy 454 would be very good. Small blocks spec around 170 . We would like to show you a description here but the site won’t allow us.
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Mercury MerCruiser Sterndrives & Engines. 1993 Mercruiser 7.4L with 135hrs on it. Did a compression test to see what was what, and was surprised to find lowest at 110psi and the highest at 125psi. Mercruiser in the service manual for 1993 thru 1997 big block 454 and 502 listed the compression pressure at 150 psi for all black production side engines. Then in 1999 Merc . The spec for 454 compression is lower than for small block 6 and cylinder engines. Around 130-140 for a healthy 454 would be very good. Small blocks spec around 170 .
Hey Guys, I dont really know whats its supposed to but I had an urge to do a compression check on the boat last week and here are the results.. Cranked each one about . Here are a couple of graphs of my 2 engines compression over time . . . the trend is somewhat down, but a couple of cylinders have shown improvement (probably deposits on . I have done a few bench test runs of my 1991 Mercruiser 454 (7.4L) after getting all back together from the valve job and general refurbishment. Yesterday, I did a . The leakdown test was great with all cylinders holding around 87 PSI with 90 PSI input. The regular cranking compression test had all cylinders between 153 and 160 PSI. .
5.7 Mercruiser/454's/454's w/V drive/120HP So, what does a good compression test look like on a 1996 330 DA? :wow: I have seen posted anything above 140. Is this a good . Re: Mercruiser 5.0L EFI Compression Test Pistons and rings are fine. The valve seats are rusted and not seating well. Do a leak down test and listen out the exhaust make sure the cylinder is at TDC or pull the valve lash back when you do the leak down test. I'm looking at a boat that has full inboard Mercruiser 350 / 260. (not I/O) I had the compression checked and all cylinders were between 145 and 150. I know the consistency is good just don't know how "good" the numbers are. What does a marine 350 start our life with? The motor is a 1987 with about 890 hours on the clock. I have a 1992 Mercruiser 454 with 1300 hours. It burns zero oil and seems to run strong, besides an oil pump issue. My mechanic did a compression test and got the below results. Is it worth fixing the oil pump (cost for the repair is 3000 plus pulling the boat out the water)? . Compression test on twin 350s revealed one or 2 cylinders with .
A V-8 of this size can easily be setup to generate in excess of 500 horsepower. While the 454 was used in high-horsepower cars such as the Corvette and Chevelle, the Chevy 454 automobile engine made 330 horsepower stock. Chevy's parent company, General Motors, adapted the 454 automobile engine into the 330-horsepower, 454 marine engine. 454 mercruiser. Hubby just did a compression test. All cylinders are reading 120 psi except for 3 and 5. They - Answered by a verified Marine Electronics Expert . I have a 95 chaparral sunesta 250 with a mercruiser 454 and bravo 3. Runs rich at idle (smell gas), I think it has a weber (electric choke, 2 adjustments screws on front). Runs good .
Did a compression test on my 5.7L 350 mercruiser and I had 175psi across all cylinders accept for one cylinder at 180psi. Is this acceptable? Reactions: javierlopez123. Reply. Upvote 0. split172 Member. Aug 3, 2015 531 712 Orange County Name One More Boat Name Steiger Craft 25 Jun 4, 2022 #2 After begging for a compression test from the first three mechanics who had no idea what I was talking about, the last mechanic came and did one unsolicited. . A Crusader 454 and a Mercruiser 454 would essentially be the same engine .-----Not sure why a shop would say " we will not work on it " Reply. RicardoMarine Gold Medal Contributor. Jan . I have wellcraft 32 with 2 mercruiser 454 inboards. Engines are well maintained and run well but stb engine is steaming badly from the exhaust. . Since you now have the plugs out, try a compression test next. A. anglosax Seaman Apprentice. Joined May 1, 2010 Messages 33. May 11, 2010 #4 Re: mercruiser 454 too much steam in exhaust
hi to all 454 gurus The story so far - 1989 mercruiser 454 with a history of problems with water in the oil. Previous owner rebuilt this engine {reasons unknown] and the rebuilder reported a failed oil cooler that put seawater into the sump on commissioning. he replaced oil cooler and changed oil 3 times and reported all now ok. 6 months later , engine is sounding . Here is a quick tutorial on how to do a compression test on a marine (or any) engine. In this video I will be doing a compression check on each cylinder of .Doing a compression test on the starboard engine trying to find a running issue.
454 cid specifications standard displacement (liter/cid) 7.4l / 454 cylinders v-8 bore & stroke (inches) 4.25 x 4.00 compression ratio 8.4:1 fuel system 4 bbl holley ignition delco electronic full throttle operation (carbureted) 4000 - 4400 rotation (flywheel) (opposite rotation available on sportpac only) ccw/cw
I have a friend that has a line on a 330hp mercruiser 454 out of an early 90's boat. I've got a '95 chevy with a non-vortec 454 that I believe was originally rated at 195hp or something embarassing like that. . Before you go spending any money on it, do a compression test, if you can, pull the exhaust manifolds and look for signs of water . MerCruiser sterndrive manuals OMC sterndrive manuals Volvo Penta marine engine manuals . Boat Accessories Shop by Accessory Category . I'd do the compression test with all the plugs out, motor should turn over easily. Put a wrench on the a front pulley bolt and turn by hand, if it doesn't turn easily, expecially with the plugs out, forget it .
This video shows how to do a compression test on a marine gasoline sterndrive engine.
MerCruiser MCM 454 Mag MPI engine pdf manual download. Also for: Mercruiser mcm 502 mag mpi, Mercruiser mie 454 mag mpi horizon, Mercruiser mie 8.2l mpi, Mercruiser mcm 7.4l mpi, Mercruiser mie 7.4l mpi. . I have an 89 Mercruiser 7.4 MPI with a bravo I, I apparently need to replace gimble bearing (clicking in neutral and in gear, and pretty good vibration), how big of a deal is this? I do about 95% of maintenance on my cars (from Oil Changes to suspension, drive shafts, PS Pumps, Ignition. hello iboats well am back again .i want to know the correct way for timing my 454 mercruiser. .what i did was at idle speed 700 rpm i just set the timing at 8 btdc and lock the distributor down, the problem am having is, with load it will not go past 3800 rpm . even when i drop down to a pop two pitch lower same thing. i was told maybe i need to do the distributor .
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454 Mercruiser CI. Thanks scoflaw. I heard that the filter needs to be Quicksilver Mercury brand? Nov 4, 2020 #4 Snapon24 Active Member. Sep 16, 2018 . After the first oil change I did a compression test on warm engine. All cylenders were within 5%. I do not remember the exact numbers. Engine still works well has 3,200 hours on it, does not . Mercruiser 454 Oil Burn. Thread starter Mike; Start date Apr 14, 2008; Apr 14, 2008 #1 Mike New Member. May 29, 2007 62 . A compression test will tell you quickly if you have a problem with engine wear in the cylinders add a leak down test and you can verify the condition of the valve seats. Rule out those to concerns and you can probably get . Marine: Boating, Sailing, PWC, Nautical Navigational GPS - Removing the head on a mercruiser - I am planning to remove the risers and manafolds on my mercruiser 454. Then i need to remove the head as i am sure I have afew bad valves. I did a compression test, the pressure in #1 cylinder was 120psi #3 0 psi #5 30 psi #7
Mercruiser Sterndrive Forum . 1995 7.4 L compression readings. Thread starter . 1995 Maxum 2700scr 7.4 L 454 carb Bravo 2 . Did compression test all 102-108 psi warm/dry. Leakdown test 6-8 % on all. Oem manual says 150psi . Later bulletin from merc says 100 psi minimum ok. Thought compression seemed low?In this video I use a PicoScope to diagnose this rough running 8.1. Without taking out any spark plugs I can easily identify the cylinder(s) that have low or. Its a 1980 mercruiser 470. I've got the entire engine & outdrive serviced, oil & a/f changed, plugs changed, n?w solenoid & ignitor, the boat doesn't wanna start. Confirmed I've got spark on all four cylinder, battery charged & gas in tank. So here lies my next dilemma; like I mentioned on my. 5.7 Mercruiser/454's/454's w/V drive/120HP. So, what does a good compression test look like on a 1996 330 DA? :wow: I have seen posted anything above 140. . They also use the same method to run a dynamic compression test when invoked by the user to identify a weak cylinder. I may be restating the method you describe, just interested to know .
I've got what is supposed to be a stock 454 / 330hp in my boat. My SnapOn compression test gauge tells me that all the cylinders range between 152 and 156 psi, while cranking. I'm looking at another boat that I'm interested in, and the guy that owns it tells me he's running a stock 454 Mag, and the cranking compression checks at 126 +/- 3 psi. I have a 1998 Falcon 2500BR with a Mercruiser 454 MAG EFI. Since I got it a year ago it has always ran a little rich (black soot on back of boat and slight smoke at times). Decided to install new spark plugs and used NGK BPR6FS plugs. Took it to the lake for the weekend and ran for about 5-6.
Mercruiser Gasoline Engine Compressio
Mercruiser 7.4L compression test after valve job
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mercruiser 454 compression test|Mercruiser 7.4L compression test after valve job