Knocking sound in engine

[ddred]

I have a 240sx 93 fstbck, drives fine 184000 on the odometer and makes this knocking sound in the engine. Mechanic said that some nissans nake that kind of sound,,, dont sound right to me,.. any suggestions

[AZhitman]

I have a 240sx 93 fstbck, drives fine 184000 on the odometer and makes this knocking sound in the engine. Mechanic said that some nissans nake that kind of sound,,, dont sound right to me,.. any suggestions

Welcome aboard!

Need more info.

Take a long screwdriver and place it at the front of the valve cover (where it meets the head) and put your ear on the handle. Is the sound more of a "clicking" coming from there? If so, no biggie. Timing chain guide.

If it's a deeper "knocking" sound, does the sound ONLY happen at idle and deceleration (but go away under load)? Test by placing it in D and holding the brake while lightly presing the throttle (or putting it in gear and lightly applying the e-brake while accelerating).

If the sound goes away (or gets quieter) under load, it's likely a bearing and you're pulling a motor out.

[ddred]

I did the test and the sound went away when i put it in gear, use the e-brake and accelerated. the knocking is a deep sound. when i started at first there was no sound but then after idling for 2 mins it started. thanks, so do u think its just the bearing?

[sx moneypit]

Pull one spark plug wire off at a time and see if the knocking goes away or gets quieter. This will help you isolate the cylinder the knocking is on and tells you if you do have a bad bearing.(takes the load off the bearing).

[butler86clint]

im new to the forum. as well as the sr20det redtop turbo. which is what is currently in my 92. im on the second motor and this one knocks like woodpecker in the block lol. can anyone tell me what it be? rod knock etc?a it does it when i hit the gas at about 2000 rpm and just gets worse from there.

[bens240sx]

im new to the forum. as well as the sr20det redtop turbo. which is what is currently in my 92. im on the second motor and this one knocks like woodpecker in the block lol. can anyone tell me what it be? rod knock etc?a it does it when i hit the gas at about 2000 rpm and just gets worse from there.

what you hav sounds like a rod know from a bad bearing i have been through that sound bout 2 times due to bad oil pump but i garentee you thats what it is

[ddred]

hey moneypit, I took it to a mechanic for a check and he is bent on telling me its the time chain that is loose. Do I run the engine while I pull the plugs individually?

[ericb382]

hey moneypit, I took it to a mechanic for a check and he is bent on telling me its the time chain that is loose. Do I run the engine while I pull the plugs individually?

Yes. Run the engine so you hear the knocking. Pull them one at a time. Does the knock go away with any one cylinder not firing?

[htbyrico]

frist check your oil for any metal flack in it!! you just might need a new motor bro hope the best to you!! sound like a rod is bout to blow!!

[butler86clint]

so rod knock then? so any suggestions? that joker on jdm engine source gave me a crap motor huh? what is wierd is i been giving it hell for like month and still drivin it evary day.. wouidnt it of thrown a rod by now?

[butler86clint]

sorry.. that was to bens240sx.. unless you know whats up wit it? am i lookin at a rebuild or new motor?

[ddred]

ok, here's the deal,,, I checked the oil and there is no metal stuff on it,,,(clean)I removed the plugs as suggested and the knocking sounds the same for all, did not go away... does this still sound like the rod or the chain? the mechhanic was saying could be chain and tensioner!!!-

will post any new findings

[htbyrico]

sent you a message on yahoo !!

[ericb382]

doesn't sound like rod knock. Did you listen to it with a stethascope (or screw driver if you don't have one) like recomended?

[bens240sx]

does the knck get louder when the rpms go up search you tube see if it sounds like any of those 240 rod knocks and there may not always be meatal in the oil if the bearing is gone if it is early in the rod blowing

[rioredstang]

Sometimes a crack in the flywheel can make a knocking sound and goes away when in gear. If you remove the starter and look thru the hole you may be able to see a crack. Just something else to consider.

[Psw Jdm]

if its a timing chain rattle i could help.

[ddred]

thanks Bro, will let you know what I find out

[david.lee264]

Its not a big problem. Get it solved by related mechanic.

[butler86clint]

Yea, as the rpm's climb the knock get's louder.. So you think its a rod bearing?

[bens240sx]

yup sound like it deffenitly if its a auto put some load on it the see if it got a lil worse if it did then you have a rod bearing going

[htbyrico]

hey bro any luck on what i told you to do??

[ddred]

Ok guys the sound is a timimg chain problem, I will try post a video of the sound.below is a pic of the valve cover off, and we can see the tensioner pushed all the way in. well am hoping that this is the real prob of the sound. mechanic also said the teeth are worn so seems i need a full kit.

[ddred]

this is the url for the video, i havent changed it yet so i can do another vid,

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

[ddred]

hey bro,did not do that yet, but this is what i did. I had the valve cover removed and the tensioner was pushed all the way in, mechanic said it is bad, also he said the sprockets are worn a bit. but most people from what I am hearing is saying it is the chain guide, so I am planning to remove it and see if the sound goes away.this is the link to a pic of the tensioner

car engine 017.JPG - 3.05MB

link to the soundhttp://www.youtube.com/watch?v=OUpXfhlYxMc

[htbyrico]

man i wish i seen that video befor yep that does sound like its the timming chain gide or ten, well keep my up to date bro you luck out on this 1 !!! ez fix there!! if you need anything hit me up !!

[bens240sx]

yep def timing chain the vid makes it somuch easier

[ddred]

knocking sound fixed. you guys are the best. I will post a link to the new soound and pic of the chain guide. I removed the guides 1 and 2 and I used a lubricant to loosen up the tensioner. It took about 1/2 hour to take the valve cover and camshaft cover off. mechanic was ready to charge me $1000 to do a chain job..

[htbyrico]

we do all work and we do it very well...because we love our Nissan !! glad you fix it bro !! good job... sorry on the late post !!

[OutToWinPAHC]

After hearing the video I was like Yup its the guide, but at that mileage you may want to do a new tensioner.