The Stovebolt.com Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Helping out ...


EVENTS

Check in for status!

Jump over to the Events Forum, to post events -- new ones or the ones we have been enjoying for some time.
Look to see what's been cancelled or postponed.

Encourage one another!

Stovebolt Site Search
 
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
12 members (dirtball, EdPruss, Flatblu4748, 3800GUY, dands, 1 invisible), 191 guests, and 3 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums50
Topics122,129
Posts979,676
Members44,158
Most Online1,229
Jan 21st, 2020
Image Posting Policy
Previous Thread
Next Thread
Print Thread
Strange knocking sound
#1384479 Sat Nov 14 2020 05:02 AM
Joined: Jul 2004
Posts: 3,614
R
Shop Shark
I won't be doing anything with this till spring, but wanted to get some ideas. It's on the '59 Viking 40 I just got.
I got the 283 running, and it actually runs quite well--sat there and idled as nice as could be. But when I drove it around the yard it sounds just like a rod is knocking. I assumed the worst and that the engine was knocking because it was now under load.
I mentioned this to the PO and he and his brother both said , "it's not the engine--it's the transmission--it's done that for years."
So I'm thinking--"how can I put the engine under load without the transmission turning in order to test this?' So I drove it up against a big oak tree and lugged it down. Even killed it once. No knock! So apparently they were right. It must be in the transmission or drive train somewhere.
I haven't driven it out on the road yet or at high speed, since it currently has no brakes. Just around the yard in first and second gear. It also does it in reverse.
As I mentioned, it's getting too cold to do anything more with it now, as it won't fit into my shop. We'll look into it in the spring. But just wondering if anyone had any idea as to what might be going on in there.
Thanks in advance!
Sorry this got to be so long!

Last edited by Rich'sToys; Sat Nov 14 2020 05:06 AM. Reason: added info

Rich

'47 Loadmaster [stovebolt.com]

Time flies like an arrow.
Fruit flies like a banana.






Re: Strange knocking sound
Rich'sToys #1384483 Sat Nov 14 2020 05:57 AM
Joined: Sep 2011
Posts: 795
B
Shop Shark
Does this rig have a transmission mounted park brake?


BC
1960 Chevy C10 driver 235 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
G.M dealer tech since 1980 & counting
Re: Strange knocking sound
Rich'sToys #1384577 Sun Nov 15 2020 02:25 AM
Joined: Mar 2004
Posts: 4,766
M
Shop Shark
Your U-joints could be bad causing a snapping sound. To check them chock the tires so the truck can't roll, then release the parking brake and put the trans in neutral. Now slide under and twist the drive shaft back and forth and see if there is any slop in the U-joints.

You shouldn't have to wait till spring to make this simple test...

Mike B smile

Re: Strange knocking sound
BC59 #1384590 Sun Nov 15 2020 04:36 AM
Joined: Jul 2004
Posts: 3,614
R
Shop Shark
Originally Posted by BC59
Does this rig have a transmission mounted park brake?

It does. I used it when we were towing the truck home, as the other brakes are not yet working.

Mike, I'll try and get under it one of these days and double check those U-joints. I was under there once, and they didn't seem too bad, but probably worth checking again.


Rich

'47 Loadmaster [stovebolt.com]

Time flies like an arrow.
Fruit flies like a banana.






Re: Strange knocking sound
Rich'sToys #1384591 Sun Nov 15 2020 05:02 AM
Joined: Feb 2004
Posts: 21,577
H
Boltergeist
Jack up both rear wheels and support the axle tubes with heavy duty jack stands. Start the engine, put the transmission in gear, and listen for the noise. Then carefully inspect all the moving parts to see if you can locate the noise. Stay well away from the moving wheels if you choose to crawl around under the truck.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Strange knocking sound
Rich'sToys #1384607 Sun Nov 15 2020 02:42 PM
Joined: Jun 2005
Posts: 778
V
VEW Offline
Shop Shark
All good recommendations, but I like the KISS principle. A loose transmission brake can make a lot of noise.


Victor

41 3/4 Ton Pick Up (in process)
55 Grumman Kurbside (Doughboy) 235/3 on tree w/ OD
57 3100
58 C4400 Viking (Thor)
59 C4500 Short Bus (Magic Bus)
59 G3800 1 Ton Dually (Chief)


Re: Strange knocking sound
Rich'sToys #1384672 Sun Nov 15 2020 10:48 PM
Joined: Feb 2016
Posts: 440
7
Shop Shark
Just curious, what's your oil pressure. I would suspect U-joints also. Mine is 160.5" wheelbase with 3 piece drive shaft and two midship bearings - lots of chance for noise in this set-up.


1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto

Moderated by  69Cuda, Grigg 

Link Copied to Clipboard
Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.4