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| Strange engine vibration in rebuilt 1.0L | |
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| Tweet Topic Started: Aug 31 2009, 03:50 PM (3,939 Views) | |
| rmcelwee | Aug 31 2009, 03:50 PM Post #1 |
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I'm still having problems with my engine vibration. I wrote about this a few weeks ago but I have further details so I thought I would start another thread (instead of having misinformation in it). I rebuilt the top and bottom of a 1.0L engine. Everything went smoothly and the car ran great. A few weeks later I swapped out my 'vert 5-speed tranny with one from an XFI. Afterwards I could feel a vibration in the clutch pedal while driving. I now think it has nothing to do with the tranny (see below). Also, when the idle is low the engine sometimes shakes. New info: The vibration seems to be from the engine because it will happen if the car is in or out of gear. I can take the car out of gear, push on the clutch, and rev the engine and feel the vibration come and go. There is a sweet spot that I can hit (say 2500 RPM) where there is no vibration. Above and below that there is a vibration. I don't see any problems with the motor mounts but maybe I am looking at them incorrectly. I did have a problem with one of the mounting bolts (passenger side) where it came out and the engine was kind of dropped down in that corner. I'm not sure how long it was like that but I drove the car like that for a bit (I didn't know). Any ideas on what to look at? |
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| starscream5000 | Aug 31 2009, 04:35 PM Post #2 |
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Got 70 MPG?
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Missing thrust bearing? Warped flywheel? |
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| mwebb | Aug 31 2009, 04:43 PM Post #3 |
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FOG
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i had not thought of that , but yes if the engine used to be connected to an automatic transmission it may be missing the pilot bearing ... also , the clutch disc or pressure plate may have been "tweaked" during the installation if the weight of the transaxle was suspended by the clutch disc ..... either way , this does not sound like it is engine related |
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| rmcelwee | Aug 31 2009, 09:19 PM Post #4 |
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The vibration is present if the car is in or out of gear. The vibration changes based on RPM. It HAS to be engine related (or at least seems like it is). |
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| rmcelwee | Aug 31 2009, 09:21 PM Post #5 |
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Oh, the pilot bearing is in there (replaced with a new one) and the flywheel looked OK when it went in (whatever that means). |
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| mwebb | Aug 31 2009, 10:42 PM Post #6 |
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FOG
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if you bent the clutch disc or pressure plate it is possible to get a vibration even with the clutch pedal IN . i did an engine in an old T10 blazer years ago , installed original flywheel to the "new" engine , but the crankshaft of the "new" engine was not correct for the assembly and the counter weights were installed in the wrong place . that would shake your teeth right out of your head . replaced that engine two times for the same problem , after that a new GM crate engine , i gave no more business to the frankenstein vendor and forced two labor claims , what fun . i have seen the effects on clutch discs of other techs after hanging the transaxle on the clutch looking around for the bolts ... can cause a very hard to track down vibration when the clutch disc center bends just a little teeney weenie bit from the weight of the transaxle if the dowel pins in the bell housing to engine block are missing that will shear the center right out of a clutch disc in no time , i have seen that . 2x in 30 years . i never saw missing dowel pins for a pressure plate install , but i imagine that would also cause severe to mild vibration as well ........................... all this is assuming the engine is not misfiring is the engine misfiring ? is intake vacuum at hot idle about 20" with a rock steady solid smooth needle ? no flutter in the needle at all ? |
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| Murf 59 | Sep 1 2009, 07:17 PM Post #7 |
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Good post Webb, It is the same advice I was gonna post. If that fly wheel in not balance to that engine it could be really bad! They can shear off and come in the car with you. I have seen the rubber dounuts that connect the Fiat trans to the drive shaft come apart and nearly cut the car in 2. Is the fly wheel in the car the one that came with this engine? Error on the side of caution. Vibes are very hard to track down some times. Start eliminating components. One by one then it will make its self known. It is a pain in the ass, but has to be done. |
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| rmcelwee | Sep 2 2009, 04:29 AM Post #8 |
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Hmm, I had a hell of a time getting the tranny to line up. I could have bent something in there. The dowel pins are in there but I left one bolt out (didn't think it was a big deal because when I took the tranny out of the donor car there were 2 or 3 of them missing). There was no vibration after the engine rebuild. It only happened after the tranny swap (maybe a month later). I have yet to put a vac gauge in the car but will do so soon and report on the needle. |
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| rmcelwee | Sep 2 2009, 06:35 PM Post #9 |
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OK, definitely not missing. I can run the car up to a good RPM, let the car coast (where the injectors are off) and still feel the vibration. |
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| rmcelwee | Sep 7 2009, 01:48 PM Post #10 |
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I just spent a couple of hours (yes, it took me that long) inspecting the three motor mounts on my Metro. I don't see any problems with them at all. Most looked pretty new and none had any cracks, rips, etc. Any ideas? |
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| billy508 | Sep 7 2009, 02:18 PM Post #11 |
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billy508
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Maybe a bad clutch plate or disk? Clutch plate might be out of balance. Slight chance but maybe a piece of the clutch disk has come loose. When I built mine I put it together on the floor. I forgot to tighten the bolts, later on I had a shutter and shake when I went to take off. I could take off in 2nd ok. Retightened the bolts and all was good. cg Also could there be a issue the front pulley/assembly? Just a idea.
Edited by billy508, Sep 7 2009, 02:21 PM.
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| rmcelwee | Sep 7 2009, 02:53 PM Post #12 |
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Which bolts did you forget to tighten? |
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| billy508 | Sep 7 2009, 04:13 PM Post #13 |
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billy508
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The ones that hold the trans to the block. |
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| rmcelwee | Sep 7 2009, 04:24 PM Post #14 |
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Video: Edited by rmcelwee, Sep 7 2009, 08:39 PM.
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| padodgens | Sep 26 2009, 02:32 PM Post #15 |
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Fresh Fish
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I just went through an engine swap on a 93 Metro Convertable. Engine had a similar vibration. Removed tranny (manual 5 speed) and checked the flywheel, clutch and pressure plate. Replaced all three with new premium from NAPA. Vibration is stil there. Gets worse at about 2500 rpm in all sppeds. Center mount on firewall looks to be touching firewall and front mount is hard toward the rear of bracket. I checked the input shaft on the manual tranny and it ran true. About to run out of ideas. Advice would be appreciated. email padodgens@yahoo.com |
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