Hans1965 Posted November 17, 2023 Share Posted November 17, 2023 Hi all, My just finished again 49 Roadmaster Riviera gives me some headache. First starting was hard, and the carburetor was spitting and fuel starving, installed an electric fuel pump to tackle that. Today it was hardly possible to accelerate, hard starting again and then it happened, i wanted to drive in reverse into my garage and the dynaflow made a terrible clunky noise. I had to overcome a small road bump and had to press the paddle harder than on an even surface. Engine still fine. Forward was still okay, but the noise on reverse was kind of reproducible. Very much worrying me. The battery was dead then and i just pushed the car back. I really fear there is some mechanical damage. Any idea what might have happened? Very frustrating. Thanks a lot! Hans 😔😔😔 Link to comment Share on other sites More sharing options...
Fr. Buick Posted November 17, 2023 Share Posted November 17, 2023 Replace engine and trans mounts, and the thrust pad. Then adjust your trans control rod/selector . If the drivetrain is loose from old mounts, it can move around and mess with the adjustment. 1 1 Link to comment Share on other sites More sharing options...
Hans1965 Posted November 17, 2023 Author Share Posted November 17, 2023 All mounts, engine and transmission, were changed before. You mean it was possibly not fully in reverse? Link to comment Share on other sites More sharing options...
Fr. Buick Posted November 17, 2023 Share Posted November 17, 2023 Could be. Check your adjustments. 1 Link to comment Share on other sites More sharing options...
JohnD1956 Posted November 17, 2023 Share Posted November 17, 2023 What engine RPM do you have it set at? If much higher than the factory recommended setting it could make a loud clunk going into reverse. For example, on my 56, i used to run a 700RPM while the factory setting is 550. At 700 it might clunk going into reverse but at 550 it doesn't. At 700 I would let my foot off the brake pedal when shifting into reverse and the clunk was reduced, but still there. At 550 it seems the clunk stopped. Of note is that at 550 the engine sounds like it is barely running, and in summer driving I will pop it into Neutral at traffic lights or road stoppages and raise the idle with the accelerator, but that is more to reduce heat buildup. But you may have to have everything dialed in just right to feel confident at that slow idle speed. Link to comment Share on other sites More sharing options...
Hans1965 Posted November 17, 2023 Author Share Posted November 17, 2023 Hi John, thanks for sharing your experience! It is similar with my 53. With the 49 i ment something different It is not noisy when changing into reverse, but when the car is at an obstacle and cannot move freely. I had a too high bump from street to sidewalk and tried to accelerate to make it over this hurdle. And then it happened. I just tried again. When the surface is flat, it drives back without issues. Just made another testdrive. Same place, same terrible noise again. But it looks like it is still driveable. That is a big relief. Thanks for commenting, John. You always try to help. Appreciate that. 1 Link to comment Share on other sites More sharing options...
EmTee Posted November 17, 2023 Share Posted November 17, 2023 Is the noise coming from the transmission, or could something under the car be scraping against or hitting the obstacle? Link to comment Share on other sites More sharing options...
Oldtech Posted December 2, 2023 Share Posted December 2, 2023 Could the rear axle be bumping the back of the trans somehow. Loose or worn Torqueball. (Just thinking out loud) Link to comment Share on other sites More sharing options...
EmTee Posted December 2, 2023 Share Posted December 2, 2023 Excessive pinion lash? Link to comment Share on other sites More sharing options...
old-tank Posted December 2, 2023 Share Posted December 2, 2023 On 11/17/2023 at 10:00 AM, Hans1965 said: All mounts, engine and transmission, were changed before. You mean it was possibly not fully in reverse? On 11/17/2023 at 10:21 AM, Fr. Buick said: Could be. Check your adjustments. Anytime the engine is removed and replaced or if the transmission and motor mounts and thrust pattern changed you should readjust the shift linkage. This is more important in the early dynaflow that does not have detents in the transmission for the shifting. Sometimes you have to adjust again after everything is settled. If not adjusted correctly you get function problems or the thing will howl in protest. Link to comment Share on other sites More sharing options...
Dan O Posted December 25, 2023 Share Posted December 25, 2023 Did you ever figure this out? Snowed in? Merry Christmas from Texas! Link to comment Share on other sites More sharing options...
Hans1965 Posted December 31, 2023 Author Share Posted December 31, 2023 Only see the last two replies now, sorry. I was too busy at work the last two months to tackle this problem. The car is now in winter storage in a quite far away garage. Currently changing the exhaust front to rear on my 47 Super sedanet in my little workshop. When it's done, I will change cars again.... Hope you had a merry Xmas, too!! Happy New Year! Link to comment Share on other sites More sharing options...
Hans1965 Posted April 7 Author Share Posted April 7 Still have this problem. I checked the linkage and I flushed even the Dynaflow. When I go into reverse in the first moment nothing happens. When I give a liitle gas it starts rumbling and shaking. So heavily tbat i need to push back into L or D. Then I drove back, arrived at my garage and the dynaflow spit some fluid out, ca. half a liter. After shutting off the engine and waiting for 5 min, the reverse was back. I drove 2 m back and forth a few times and then it lost again fluid and I had no forward or reverse gear anymore. ... Does anyone have an idea? Link to comment Share on other sites More sharing options...
Century Eight Posted April 17 Share Posted April 17 (edited) Hans, I know you have checked a lot of things, but when my engine is revving too high, I will get that terrible clunk noise in my ‘50 Super when I want to go into reverse. So no matter what gear I am in, I go to neutral for a few seconds before I put it into reverse. This seems to greatly eliminate the clunk noise. You have to be careful not to do it too fast. Edited April 17 by Century Eight (see edit history) Link to comment Share on other sites More sharing options...
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