weird engine sound

cream_of_slop · Posted: Thu Aug 13, 2015 6:48 pm Post subject: weird engine sound

hello everyone, i just got a 1969 bay window bus the other day. It has a new trans-axle and engine. The seller says that the engine is new it is a 1776cc with dual EMPI carburetors. this really weird, loud sound comes from the engine, it sounds like a tin can being crushed, you can't hear it very well in this video https://www.youtube.com/watch?v=9ysz1tV_vsg but it is loud. i think a rod is bent, do you guys have any ideas what it might be and how i may be able to fix it. thanks

Tcash · Posted: Thu Aug 13, 2015 8:01 pm Post subject:

Hard to tell in the video.
Do you have this black plastic thing under the fuel pump.

Image may have been reduced in size. Click image to view fullscreen.

Pull the spark plug wires one at a time and see if the noise goes away. Note which wire if it does.

Good luck
Tcash

scrivyscriv · Posted: Thu Aug 13, 2015 8:19 pm Post subject:

Almost sounds like something knocking around inside the intake
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cream_of_slop · Posted: Thu Aug 13, 2015 8:28 pm Post subject:

i actually have an electric fuel pump does this matter?

cream_of_slop · Posted: Thu Aug 13, 2015 8:30 pm Post subject:

richparker · Posted: Thu Aug 13, 2015 8:31 pm Post subject:

That don't sound good...

Couple things to check maybe...is the starter sticking on, I've had that happen before sounds similar. Maybe the fly wheel is a bit loose. I would start by draining the oil and pull the strainer and look for metal or any material for that matter. Pull plugs and inspect, maybe one broke and is floating around in the jug F-ing things up. After checking the fuel pump as Tcash suggested I would sync the carbs. Possible engine pull in your future.
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paulsvwbug · Samba Member Joined: May 21, 2006 Posts: 450

What does it sound off idle, around 1500 rpm's? Does the noise increase with engine rpm or steady? even off idle? what about on acceleration, does it pop? backfire? fall on its face? get back to us, more info

cream_of_slop · Posted: Thu Aug 13, 2015 8:39 pm Post subject:

The noise occurs more often at a high rpm also, the engine seems to have low power, and takes about a minute to start but i think this is an issue with the carbs as we are still working to adjust & sync them.

Tcash · Posted: Thu Aug 13, 2015 8:40 pm Post subject:

cream_of_slop · Posted: Thu Aug 13, 2015 8:56 pm Post subject:

i will try the tings you guys said tomorrow night when i have a chance, anyone else have any ideas or any more information i could give? i was busy and had my brother look at it, he said when he was under the car he saw something bent, but he is not sure what it was, he suspects that when the previous owner put the engine in they bent it, he said it might be a rod, sorry, i just found this out i would have told you guys this earlier

airschooled · Posted: Thu Aug 13, 2015 9:05 pm Post subject:

Have you tried removing the belt to make sure it's not something stuck in the fan? It's a long shot, but it's common. (Also, is your belt on backwards in the pic?)

Next up, remove the oil filler cap at idle and listen in. You can hear a surprising amount of detail of what's going on in there if you concentrate. In a clean environment, I have also run engines for a few seconds with the valve covers off for diagnosis.

Good luck,
Robbie
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richparker · Posted: Thu Aug 13, 2015 9:25 pm Post subject:

cream_of_slop · Posted: Thu Aug 13, 2015 9:43 pm Post subject:

just looked it up and that might be it, but i will look and see if it is that tube that is bent. thanks to everyone that helped me tonight i will come back tomorrow, if not, the next day and update you guys thanks again have a great night/ morning Very Happy

Tcash · Posted: Thu Aug 13, 2015 9:45 pm Post subject:

he suspects that when the previous owner put the engine in they bent it,
Bent what? Post a picture.
Tcash

cream_of_slop · Posted: Thu Aug 13, 2015 9:54 pm Post subject:

it is 1 am here and i do not want my dogs to see the outside light they will flip and wake everyone up, hopefully my phone flash will cut it, ill be back in a second

cream_of_slop · Posted: Thu Aug 13, 2015 10:00 pm Post subject:

i actually could not find the bent thing he was talking about i assume he was talking about a push rod tube i can get a few pictures tomorrow thanks

Tcash · Posted: Thu Aug 13, 2015 10:03 pm Post subject:

You will be looking for something like this.

Good night
Tcash

SGKent · Posted: Thu Aug 13, 2015 11:04 pm Post subject:

Get a $3 stethoscope or piece of hose and listen around, Stay away from the belt. That noise has a high pitch to it so it will be directional.
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cream_of_slop · Posted: Fri Aug 14, 2015 12:56 pm Post subject:

looks like 2 of the tubes are bent i was able to get a picture http://imgur.com/q52hbwR the other side was fine, do you think this could be it? it looks pretty minor, but maybe i'm wrong

airschooled · Posted: Fri Aug 14, 2015 2:44 pm Post subject:


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