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pancho
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« on: April 10, 2016, 06:02:29 AM » |
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I had the head off my Mitsubishi 4G64 motor to replace a head gasket, and decided to reuse the timing belt as my reasoning told me it still had 30 or 40 K miles on it, as I had put it on a couple of years ago. Well, I guess I was not thinking and put it on in the opposite direction it had come off (I did not mark it). This is what happened in a week or two. Old belt on the left   Well, this motor has been identified as an "interference engine in which the possibility of piston to valve damage in the event of belt failure is MOST LIKELY to occur",, but I did a compression test after belt replacement and had 167-170 in all cylinders. So, I thanked the Lord, timed everything up and bolted it back together yesterday, fired it up and tried to go around the block,, it is running, but all out of whack,, not sure what is going on. Guess I will get back into it tomorrow,, any ideas? The moral of the story is,, if you are going to remove a timing belt,, it is probably a good idea to have a new one on hand and replace it,, no matter what it looks like or how old it is. |
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« Last Edit: April 10, 2016, 06:45:45 AM by pancho »
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The most expensive things you will purchase, are those things you would not have needed if you had listened and obeyed.
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sandy
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« Reply #1 on: April 10, 2016, 11:30:35 AM » |
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You're probably off one tooth on the belt marks.
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BobB
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« Reply #2 on: April 10, 2016, 02:13:17 PM » |
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Well, I would say you got extremely lucky. I've read that our beasts will operate one tooth off, so Sandy is probably right...
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98valk
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« Reply #3 on: April 10, 2016, 03:49:53 PM » |
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u put the belt on backwards and it failed. so u are blaming the belt for the failure and suggest to replace no matter what?? makes no sense, u installed a part incorrectly. maybe its just me?, I've been told by fellow engineers that its me.  |
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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pancho
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« Reply #4 on: April 10, 2016, 05:53:33 PM » |
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Not blaming anything or anyone CA,, just saying that anyone is capable of making a mistake. Some may even have a couple of beers or take a toke occasionally and are more likely to make a mistake than others. I'm just suggesting a strategy that would prevent what I did from happening to others.
Don't worry about it even if it is you CA, we all have a part to play brother.
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The most expensive things you will purchase, are those things you would not have needed if you had listened and obeyed.
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Blackduck
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« Reply #5 on: April 11, 2016, 03:13:57 AM » |
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If I remember right the timing marks on those are a bit of a pain, best guess is they are not lined up correctly. Not sure if I still have the drawings.
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2001 Standard, 78 Goldwing, VRCC 21411
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #6 on: April 11, 2016, 03:30:12 AM » |
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Maybe it was because it was put on backwards, but, maybe not. Belts break. And, as said before, they look perfect right up to the second before they decide to come apart.
I don't think I've ever replaced one that you're talking about, but, some belts can be a royal PITA to do today. You either can't see what you need to or your fingers aren't small enough.
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« Last Edit: April 11, 2016, 06:34:51 PM by Patrick »
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pancho
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« Reply #7 on: April 11, 2016, 10:20:33 AM » |
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You're right Patrick,, I don't know that I put it on backwards,, and it was a cheap belt, just two or three years old... I do believe that I am going to make it a rule, when removing a timing belt,, replace it with a new one!
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The most expensive things you will purchase, are those things you would not have needed if you had listened and obeyed.
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Brian
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« Reply #8 on: April 12, 2016, 03:47:50 AM » |
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The last time I had a timing belt off of a front wheel vehicle I pulled the plugs and turned the engine over by hand to set all the timing marks in place as I was replacing a leaking camshaft seal. This little 4 cylinder motor in my Horizon did not have very good marks that where easily seen so I made my own marks with a sharp chisel and then used a permanent black marker in the dents. Worked like a champ. Don't be afraid to add your own cheater marks no matter what you are working on.
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DK
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« Reply #9 on: April 12, 2016, 09:02:53 PM » |
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Always: "Gates Green Belt"
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Machinery has a mysterious soul and a mind of its own.
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pancho
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« Reply #10 on: April 13, 2016, 04:18:53 AM » |
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She has Gates belts on her now,,, the problem this time was I put the crank shaft position indicator, (a stamped plate on this motor) on backwards.... really need to stop mixing the intellectual and work periods from recreational activities, still learning at my age.
She's running like a champ now,,, talk about being watched out for.
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The most expensive things you will purchase, are those things you would not have needed if you had listened and obeyed.
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RONNIEB
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« Reply #11 on: April 13, 2016, 05:40:40 AM » |
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:)Pancho, backward seems to be becoming your middle name. Haha
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1999black standard; 2000 black tourer; 1999 red/black interstate  |
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pancho
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« Reply #12 on: April 13, 2016, 07:52:18 AM » |
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yeah, that's what I was thinking,,, I was going to blame it on late developing dyslexia, but decided to go with the facts...  I remember hearing about the dangers of having too much time on your hands,,,, you remember, You better watch it sonny...... |
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The most expensive things you will purchase, are those things you would not have needed if you had listened and obeyed.
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Gordy49
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« Reply #13 on: April 13, 2016, 08:03:23 AM » |
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You're right Patrick,, I don't know that I put it on backwards,, and it was a cheap belt, just two or three years old... I do believe that I am going to make it a rule, when removing a timing belt,, replace it with a new one!
Good rule, I do that when I take them off. You never know. better safe than sorry!  |
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