knocking in engine

ivysboy · Post by **ivysboy** » Tue Jun 15, 2010 10:51 pm

HELP can anybody shed some some light on a problem with my 3500 earley SD1 engine. when pulling away at about 15 =20 mph there is a knocking from the front of the engine if I close the throttle and then open it the knocking goes, I can do 70-80all day with no noise , it's only when pulling away or going up a long hill, but if I take my foot off the pedal and back on again the knocking stops? any help much appreciated.

Post by **Coops** » Tue Jun 15, 2010 10:57 pm

crank pulley bolt loose?
can you rock the pulley back and forth on the crank a bit?

spend · Post by **spend** » Tue Jun 15, 2010 11:07 pm

Damper can part at the rubber joint?

ivysboy · Post by **ivysboy** » Tue Jun 15, 2010 11:40 pm

Hi no the crank shaft pully is tight . no movement.

ivysboy · Post by **ivysboy** » Tue Jun 15, 2010 11:45 pm

the noise sounds like a small end knock? but I was told if it was a small end it would knock all the time? and that it could be the timing chain?

DEVONMAN · Post by **DEVONMAN** » Wed Jun 16, 2010 5:49 pm

Is the car an Auto or manual gearbox?

ivysboy · Post by **ivysboy** » Wed Jun 16, 2010 5:59 pm

Hi Devonman it's an auto but the knocking seems to coming from the nearside front. as it's a trike I am sitting directly behind the engine

ChrisJC · Post by **ChrisJC** » Thu Jun 17, 2010 6:53 am

Maybe the vac advance is a bit sticky?

Chris.

Will Reeve · Post by **Will Reeve** » Thu Jun 17, 2010 8:44 am

not as bad as my one was I hope:

http://www.youtube.com/watch?v=aVlsmipLxyQ

adamnreeves · Post by **adamnreeves** » Thu Jun 17, 2010 12:36 pm

Could it be pinking/knock. Too much ignition advance maybe?

ivysboy · Post by **ivysboy** » Thu Jun 17, 2010 5:05 pm

It could be I did all the timing but I have taken the timing cover off and the chain has at least an inch of slack would that cause the timing to fluxuate when pulling away. when standing still it rev's up with no knocking and sounds sweet.

badger · Post by **badger** » Fri Jun 18, 2010 7:18 am

I think there's a possibility that you've just answered your own question.....

hunkojunk · Post by **hunkojunk** » Sun Jun 27, 2010 4:41 pm

How did you get on with this fault because I have the very same with my engine. Would be interested to know what you found.

ivysboy · Post by **ivysboy** » Thu Jul 01, 2010 5:28 pm

someone told me to disconnect the tube from carb to dizzy and it seems ok now? although it was timed on a snapon timeing light the timeing was way out.

hunkojunk · Post by **hunkojunk** » Thu Jul 01, 2010 8:26 pm

Have you done the timing now and reconnected the pipe or are you leaving it off?