engine knock |
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Luchog
Grand Poobah Joined: April-17-2007 Location: Argentina Status: Offline Points: 2135 |
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Seb, any news?
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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just came from there...
bitter... First pulled the exhaust manifold complete found rust on exhaust ports on #2 and #3 cylinder, so I undo de riser, and looks like the gasket was bad and leaked water into those cylinders after shut off. I will test anyway to see if I have a cracked water jacket in the manifold. Then removed the valve cover and all plugs and turned the engine. Valves close fine. Removed the Cylinder head...geez, found the problem..blown head gasket between #2 and #3. Strange as compression on 3 was fine. Little scuff on cylinder 3. Looks like at some point overheated @ wot (didn´t notice it) and voila failure. I´m taking the head to the machine shop to test for cracks and see the valve and seats on 2 and 3 cylinders. |
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<a href="">1992 ski nautique
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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now why the knock? the blown gasket? or piston slap?
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<a href="">1992 ski nautique
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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I was just going to ask that. Curious as to why there would be a knock unless the cylinder was filled with water or something. |
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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to this point my friend and mechanic, wants to check the head, fix it and put it again...and see what happens...
or should a i just remove the engine and see whats going on from below... |
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<a href="">1992 ski nautique
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Could you put a large breaker bar/ratchet on the crankshaft pulley and give it a couple of turns and see if you see any erratic movement? Just don't loose track of piston timing/location.
Or maybe with the starter? Be sure to disconnect/pinch off fuel going to the fuel pump. |
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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yes, I removed all plugs and turned it by hand, fine. also gave it some turns with the starter and moved fine, nothing strange according to my mechanic...
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<a href="">1992 ski nautique
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Curious to know what brand head gaskets did you use? Marine?
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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yes, the ones that came on the PCM OEM kit...
I have 2 extra sets of felpro gaskets that came with the engine kit from summit...was planning on using those when I put it back together... |
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gun-driver
Grand Poobah Joined: July-18-2008 Location: Pittsburgh, Pa Status: Offline Points: 4127 |
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Did you have the knock after changing the bad plug?
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Interesting Kap. When I changed over to gt40p's I got everything together before I pulled it apart. I pulled off the old Felpro standard gaskets I had used and replaced them with PCM marine ones.Did not know what I was going to find on tear down and thought I'd be better off using the marine ones. The Felpro's looked fine and since you have them I'd use them.
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GlassSeeker
Grand Poobah Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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Kap, you just may have caught it in time, dodged a bullet. I hope it's back up and running soon.
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This is the life
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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yes still there... |
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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Don't put it back together without checking those rods
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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So definetely I will need to pull the engine to check the rods...
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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Granted I have not personally heard the "knock" but other than a valve witness mark or something on the piston to explain it I am leaning toward your water in the cylinder trying to be compressed by the piston pushing water through the head gasket and bending the rod, or head gastet leaking first but either way a bent rod Causing the knock. Or a hot piston sticking could also bend a rod. Other than the labor pullin it apart there isn much reason not to at least check the rods
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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you are correct there, it would be a double labor puting it back together to find the knock again...
I´ll go that way... |
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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unless you want to do it twice...........funny, you always find the time to pull it apart a second time,
make sure that not only they check for cracks but they check it for flatness, check the deck too...not to often does a head gasket go, without a reason, could be as simple as stretched, weak bolts, just cover your bases...I know how some mechanics can be....the famous cliche "it will be fine" which translates too, "on your dime" |
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"the things you own will start to own you"
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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good news head is fine, doing the plane and seats...
bad news will need to go further and see the lower train to find the source of the knock.... i will also need to pull apart the other exhaust manifold to take both and have them decked....still in search of a local shop that have the machine to properly do the job... |
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GlassSeeker
Grand Poobah Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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making "head"way
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This is the life
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BuffaloBFN
Grand Poobah Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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Pete has the Autozone list... |
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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no progress yet, yesterday I removed the other manifold to have the surface planed like the other, It came right off, only thing I busted a couple of knuckles in the process...
I was looking at the gaskets I have at home to compare them to the ones I removed from the engine, they are all felpro, but they are different. This in the picture, the one from the intake manifold: the one on top was intalled and the one on the bottom is the one i will use to reassemble. Other than the larger middle hole for the acc? they are quite the same. Is this OK? |
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Waterdog
Grand Poobah Joined: April-27-2006 Location: United States Status: Offline Points: 2020 |
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The hole in the middle is a exhaust cross over. Some gaskets have that little plate installed. Some you install if you want to restrict the exhaust flow through the intake.
One single plane intakes I've welded the cross over up. |
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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well ow you guys some update..
sent the head to the machine shop, and checked fine, had it resurface and cleaned. also had both manifold planed, all surfaces including the exhaust ports. finally I did not remove the engine, I turned the engine by hand and compared that all pistons would get to the max heigth, they all did. last week we put the head with new gasket and put the intake manifold. Today I went and finished intalling the rest of the things, valve covers, exhaust manifolds, new plugs, etc... fired right out, and went for a test ride.... relief no engine knock, at all, tried a couple of take off and nothing, look likr the engine is ok. Got to cruise a little hit the 3000rpm mark with no problem. anyway I need to do some tunning as i have a minimal bog upon take off, then it catches. Need to check timing or do some carb adjustment. I removed the plugs to check for water intrusion and nothing. Oil is clean, temp is fine. seems i need to give some more running time as all plugs came clean. |
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SN206
Grand Poobah Joined: February-25-2009 Location: Fort Worth, TX Status: Offline Points: 2339 |
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Good news!
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...those who have fallen and those who will.
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GlassSeeker
Grand Poobah Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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Great!
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This is the life
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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That is good news,too bad it's time to put it away
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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I'm glad to got it Seb.
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Good to hear
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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now seems like 1 1/2 month sleep, screwed up the battery....
or the timing needs to be set... on cold starts engine turns over fine, after the test drive when the engine was at running temperature, if I tryed ro restart it would crank slowly, then eventually start, but on a 3rd or or more restart it would crank very slowly. As I didn´t had the tester yestrday I could not see the volts. Today I went with the tester to take some numbers. Started with no problem, the alternator read around 14-15 volts, with peaks of 16. On the battery it read 12.06 volts...The conections at the battery were little rusty so I disconected and cleaned. Went for a ride again, 15 minutes. And went back to the marina. T was always between 140 and 160 degrees, probably low due to cold water... shut the engine, and again it cranks very slowly, it would not even start. let it cool some minutes and is starts, but on a restart is turns slowly... So either I have to much advance, or the battery needs some more time to get a full charge? Prior to the engine incident I had no problems... BTW engine runs smooth. Gary winter is cold but not as cold as yours, so I use the boat anyway. I prefer footing on winter cause less boats around, only hassle is the drysuit entry! |
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