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Re: Horrible Sound from my 261
Wally / Montana #1372654 Sun Aug 09 2020 03:37 PM
Joined: May 2001
Posts: 1,522
W
Shop Shark
I'll get some tubing.

How much oil should be coming out the little holes in the top of the rocker arms? Oil is definitely coming out all of them and overflowing the spring cap but it's much less than I thought. It has always idled very, very quietly but I was surprised to see how little oil came out there. Is it supposed to be a gusher?

Thanks!!


1948 3/4-Ton 5-Window Flatbed Chevrolet [sandeace.com]

28 Years of Daily Driving but now on hiatus. With a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Horrible Sound from my 261
Wally / Montana #1372662 Sun Aug 09 2020 04:49 PM
Joined: Jan 2001
Posts: 5,017
P
Master Gabster
Just a dribble is correct.

Last edited by Pre '68 Dave; Sun Aug 09 2020 05:56 PM.

See the USA in your vintage Chevrolet!
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Re: Horrible Sound from my 261
Wally / Montana #1372664 Sun Aug 09 2020 04:56 PM
Joined: Dec 2017
Posts: 804
D
Shop Shark
X2. With the rocker arm down compressing the spring, the Dribble lubricates the rocker arm tip and the valve Tip, and as a coolant for the valve spring, lube for rotator caps if you have them. With the rocker arm up so to speak, valve closed, lubricates the adjuster ball and pushrod seat. If it spits, It’s likely spitting over the rocker arm and that is not What you want to see. Nice even dribble.


Mike
Re: Horrible Sound from my 261
Wally / Montana #1372684 Sun Aug 09 2020 08:18 PM
Joined: May 2001
Posts: 1,522
W
Shop Shark
Good. Dribble it is.


1948 3/4-Ton 5-Window Flatbed Chevrolet [sandeace.com]

28 Years of Daily Driving but now on hiatus. With a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Horrible Sound from my 261
Wally / Montana #1372693 Sun Aug 09 2020 09:59 PM
Joined: Jan 2018
Posts: 188
4
Shop Shark
I went a step further than a stethoscope to find a suspension problem on my car, and bought a Chassis Ear. It has 6 very sensitive clip on microphones plugged into a small 6 channel amplifier hooked up to headphones. You can switch between the microphones with a selector switch. With the microphones hooked up the front suspension I could hear the key turning the ignition switch, starter,every lifter, alternator, and everything else that moves. Figured out that if I started turning down the volume down, I could filter out all of the other noises to hear what was making the loudest noise I was looking for. It's tough to hold a screwdriver to your ear listening for a suspension noise driving down the road.

Re: Horrible Sound from my 261
Wally / Montana #1373556 Sun Aug 16 2020 02:39 AM
Joined: May 2001
Posts: 1,522
W
Shop Shark
I got the damper off as discussed in separate thread. Removing Harmonic Balancer Thread. The sound remains while running up the idle for 3-4 seconds. Dang!

While cleaning up the timing gear case for removal I noticed what's in the picture. Two loose nuts on the front motor mount bolts. The engine was sitting on studs and not bolted down. Could this be the problem?

Nope. Sound persists after tightening up the bolts.

Next. Drop the pan, take off the timing gear cover, look around and get back to you.

Attached Files
Motor Mount Front.jpg (27.4 KB, 186 downloads)
Last edited by Wally / Montana; Sun Aug 16 2020 02:39 AM.

1948 3/4-Ton 5-Window Flatbed Chevrolet [sandeace.com]

28 Years of Daily Driving but now on hiatus. With a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Horrible Sound from my 261
Wally / Montana #1373573 Sun Aug 16 2020 05:31 AM
Joined: Feb 2001
Posts: 1,133
D
Shop Shark
I had an interesting sound from my original '40 216 . Eventually I pulled the timing cover etc . pics to show backlash in the gears compared to the replacement gear .

Oh, and I drilled out the oil feed pipe some , but I don't think that is likely to be an issue on your newer engine .

Jerry is correct that the crank rotation pushes the cam against the thrust plate , so , if its dry in there ???

Attached Files
Feb 2014 045.jpg (346.36 KB, 190 downloads)
Feb 2014 056.jpg (156.38 KB, 187 downloads)
Last edited by Dusty; Sun Aug 16 2020 05:34 AM.
Re: Horrible Sound from my 261
Wally / Montana #1373681 Sun Aug 16 2020 11:05 PM
Joined: May 2001
Posts: 1,522
W
Shop Shark
I'm doing things in order of ease and not necessarily in order of likelihood of the problem. I'm running out of easy things to do.

Thanks, Dusty. Here's my 16-year old timing gears for comparison. I'd say they look pristine. I turned the flywheel and the gears looked great all around. I can't see any scrape marks there or on the inside of the cover.

I dropped the oil pan, of course, to get at those 2 bolts to the timing gear cover. Things look OK to my amateur eyes. There is a tiny, tiny bit of end play in the connecting rods (1/32" maybe) but I think you want some.

So, what do you suggest I do next?

This is gone on for a while so I'll put on the video/audio again.

Thanks!!!

Attached Files
My Movie Knock.mp4 (1.51 MB, 18 downloads)
SHA1: e0fc8c00c03e7fe9e896bc830aa131907d4720c1
KnockSound261.mp4 (4.61 MB, 10 downloads)
SHA1: a1a7bf2030045e638c9061d0f532963b9bcb8fd4
Timing Gears 1.jpg (45.53 KB, 109 downloads)
Timing Gears 2.jpg (45.18 KB, 110 downloads)
Last edited by Wally / Montana; Sun Aug 16 2020 11:21 PM.

1948 3/4-Ton 5-Window Flatbed Chevrolet [sandeace.com]

28 Years of Daily Driving but now on hiatus. With a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Horrible Sound from my 261
Wally / Montana #1373689 Sun Aug 16 2020 11:38 PM
Joined: May 2001
Posts: 1,522
W
Shop Shark
Can a bad hydraulic lifter make that noise?

Also, in the above picture, there's a crimped copper tube between the gears. Is that supposed to drip oil? Any way to check that?

Last edited by Wally / Montana; Sun Aug 16 2020 11:40 PM.

1948 3/4-Ton 5-Window Flatbed Chevrolet [sandeace.com]

28 Years of Daily Driving but now on hiatus. With a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Horrible Sound from my 261
Wally / Montana #1373705 Mon Aug 17 2020 12:18 AM
Joined: Jan 2001
Posts: 5,017
P
Master Gabster
Yes oil should come out of the nozzle.
I have in the past put the pan on temporarily an run the engine to be sure oil was coming from the nozzle. If it is you may have a little oil spray to clean.
But unless you gave everything a good cleaning before the picture I suspect you aren’t getting oil there.


See the USA in your vintage Chevrolet!
My Blog
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