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Rough running after timing belts were changed


 
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towball
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Age: 54
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PostPosted: Wed May 04, 2016 13:41    Post subject: Rough running after timing belts were changed Reply with quote

Hi All,

I have a sick Shogun sport. The last couple of months have seen a few things go wrong with my 51 plate beauty who has served me well for 15 years. The latest was after changing the timing belts and tensioners last weekend. The engine idles runs quite roughly and revs poorly and is spitting un-burnt diesel from the exhaust which indicates a timing issue. I am no means a master mechanic but know my way around the 4D56 quite well. The timing marks on all pulleys and balancer shafts all lined up correctly. I always make a point of rotating any engine I change a belt on by hand to check for interference before starting, confirming all marks continue to line up correctly after a few turns. All the pulleys including crank pulleys have been checked for play / keyway wear in case that is giving a false TDC, but they are in good shape.

I'm at a loss as to what could cause this and if any of you kind people out there have any ideas, I'm listening.

Thanks

Towball
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PostPosted: Wed May 04, 2016 13:41    Post subject: Google Ads keep the POCUK free to join!


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hutchy
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PostPosted: Wed May 04, 2016 17:25    Post subject: Reply with quote

sounds like the fuel pump is out of sink 1 tooth either way will make it do what your describing Wink
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towball
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Age: 54
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PostPosted: Wed May 04, 2016 19:25    Post subject: Rough running after timing belts were changed Reply with quote

Hi Hutchy,

Thanks for the reply. The pump mark lines up perfectly also. I've changed a few of these belts in the past with no problem. I have had a friend look at it an he said it was lined up perfectly on all 3 sprockets.

Thanks,

Towball
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towball
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Age: 54
Zodiac: Cancer
Joined: 27 Aug 2007
Posts: 104
Location: South Wales

PostPosted: Mon May 09, 2016 12:48    Post subject: Rough running after timing belts were changed - Update Reply with quote

All,

I now know what is wrong. Number 4 cylinder has low compression. I pulled it all apart and found the small thin circular metal disc in between the two crank pulley sprockets had worn the woodruff key slot and was not indicating TDC properly. It must have been a tooth out. A mechanic friend of mine who has worked for Mitsi said the valves are designed to break causing minimal damage even if you turn the engine by hand.

The stripdown has started!
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towball
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Age: 54
Zodiac: Cancer
Joined: 27 Aug 2007
Posts: 104
Location: South Wales

PostPosted: Thu Jun 09, 2016 12:46    Post subject: Rough running after timing belts were changed - Update 09/06 Reply with quote

All fixed and didn't cost a penny only time. Surprising what you can miss when you are rushing!
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shoggiesteve
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PostPosted: Tue Jun 14, 2016 19:29    Post subject: Reply with quote

Glad you got it fixed mate. what did you find wrong apart from the low compression and the worn washer.
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towball
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Age: 54
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Location: South Wales

PostPosted: Thu Jun 16, 2016 14:55    Post subject: Rough running after timing belt change Reply with quote

Hi,

No the parts were just fine. Just a large lump of black *beep* blocking the intake manifold, part of it had jammed up in the valve in cylinder 4. Just cleaned it it and away and it started first time. probably need to block the EGR off to stop the formation of the *beep*.

Towball
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