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| | | | Joined: Sep 2014 Posts: 120 'Bolter | | 'Bolter Joined: Sep 2014 Posts: 120 | I have a 51 Panel with a 54 230 c.i. engine and four speed tranny.
Took it out for a test ride yesterday. Engine rpm increases substantially
when the clutch is depressed.
Can't determine how engine rpm can be related to clutch pedal being depressed.
Engine idles at normal when tranny is in neutral. Panel runs down the
road normal when in gear.
Any advice appreciated.
Jerry
1 1951 Chev Panel with a 350 small block, automatic tranny.
1 2004 Chev 2500 HD pickup... stock
1 1950 Chev 5 window pickup; 261 c.i. engine, 4 on the floor.
With lots of time and money, any Stovebolt can be restored.
| | | | | Joined: May 2015 Posts: 236 Shop Shark | | Shop Shark Joined: May 2015 Posts: 236 | To clarify your stating the RPM increase when driving only (engine and power train under load), when in in neutral and clutch depressed no change is noted.
What is the RPM change and is it consistent value.
Have you examined your motor mounts? Take a close look here for cracked and broken.
Have you examined the clutch and throttle linkage while some one operated the clutch pedal?
Baking in the nice desert sun, breathing life back into a 48 3800 5 window.
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | I have a 51 Panel with a 54 230 c.i. engine and four speed tranny. .
.
.
Jerry Jerry, 230 or 235 engine? Most likely 235. | | | | | Joined: Sep 2014 Posts: 120 'Bolter | | 'Bolter Joined: Sep 2014 Posts: 120 | 48X360
Sorry for the delay in answering.
I had to leave home to attend a funeral in Texas and will not be back until
early next week. Will try to diagnose your questions and respond with info.
Thanks,
Jerry
1 1951 Chev Panel with a 350 small block, automatic tranny.
1 2004 Chev 2500 HD pickup... stock
1 1950 Chev 5 window pickup; 261 c.i. engine, 4 on the floor.
With lots of time and money, any Stovebolt can be restored.
| | | | | Joined: Sep 2014 Posts: 120 'Bolter | | 'Bolter Joined: Sep 2014 Posts: 120 |
1 1951 Chev Panel with a 350 small block, automatic tranny.
1 2004 Chev 2500 HD pickup... stock
1 1950 Chev 5 window pickup; 261 c.i. engine, 4 on the floor.
With lots of time and money, any Stovebolt can be restored.
| | | | | Joined: May 2015 Posts: 236 Shop Shark | | Shop Shark Joined: May 2015 Posts: 236 | I suspect a bad rear mount that has broke free or near free, so when the load is removed the engine does a twist which changes the geometry of the throttle linkage.
Baking in the nice desert sun, breathing life back into a 48 3800 5 window.
| | | | | Joined: Sep 2014 Posts: 120 'Bolter | | 'Bolter Joined: Sep 2014 Posts: 120 | Thanks for you patience. I've finally returned from the funeral in Texas and will
get back working on the '51 panel.
More info to follow.
Jerry
1 1951 Chev Panel with a 350 small block, automatic tranny.
1 2004 Chev 2500 HD pickup... stock
1 1950 Chev 5 window pickup; 261 c.i. engine, 4 on the floor.
With lots of time and money, any Stovebolt can be restored.
| | | | | Joined: Sep 2014 Posts: 120 'Bolter | | 'Bolter Joined: Sep 2014 Posts: 120 | Today me and another car guy investigated the intermittant increase in rpm.
We used a automotive stethascope. Noise is coming from the bell housing area.
We think either the crank shaft bushing, the throw out bearing or clutch/pressure plate is binding and causing the idle to be restricted until the clutch is depressed.
Nothing is interfering with the throttle linkage.
On a test drive and at speed the transmission performs as normal.
Also checked motor and transmission mounts. No apparent movement of the engine when rpm is sharply increased.
So it looks to me like the transmision will have to come out. Once separated from the bell housing, new parts are sure to follow.
Record heat, 115 degrees, will shorten my work day.
Stay tuned.........
Jerry
1 1951 Chev Panel with a 350 small block, automatic tranny.
1 2004 Chev 2500 HD pickup... stock
1 1950 Chev 5 window pickup; 261 c.i. engine, 4 on the floor.
With lots of time and money, any Stovebolt can be restored.
| | | | | Joined: May 2015 Posts: 236 Shop Shark | | Shop Shark Joined: May 2015 Posts: 236 | Ah it's a wonderful day in Arizona was to be 117 here.
But only got an hour and a half in this AM not due to heat but had to get a fathers day card and Ebay ship out.
It will start to drop a few degrees on Saturday. But this evenings sky over here has clouds, hope not a monsoon that will kill my work, heat yes rain no.
Last edited by 48X3600; 06/19/2015 2:39 AM.
Baking in the nice desert sun, breathing life back into a 48 3800 5 window.
| | | | | Joined: Sep 2014 Posts: 120 'Bolter | | 'Bolter Joined: Sep 2014 Posts: 120 | Tranny out yesterday. Throw out bearing grumbles and is stiff to rotate.
. Disk and pressure plate look ok as does the fly wheel facing. Disk needs to be replaced.
Ordered clutch disk, pressure plate, throw out bearing and bronze bushing as a complete kit. Hoping that will cure the mysterious rpm changes.
Jerry
1 1951 Chev Panel with a 350 small block, automatic tranny.
1 2004 Chev 2500 HD pickup... stock
1 1950 Chev 5 window pickup; 261 c.i. engine, 4 on the floor.
With lots of time and money, any Stovebolt can be restored.
| | | | | Joined: Oct 2013 Posts: 97 Shop Shark | | Shop Shark Joined: Oct 2013 Posts: 97 | Be sure and let us know if you cured the problem .....
Lane
sweetpealane
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