rattle! - Competition Diesel.Com

kasey200 · 03-01-2011, 08:25 AM

Just finished up my 12v swap into an 03 excursion and i have a question for those of you that have done a similar swap. This thing has a harmonic vibration that rattles the interior of the truck like crazy when it's at certain RPM's at or near idle. Once you start ot accellerate (above 1000 rpm or so) the vibration goes away. It's not a slight vibration......... you can actually see the entire dash panel vibrate. FYI, I used fordcummins motormounts. Anybody else experience this???

ozone burner · 03-01-2011, 09:54 AM

mine did that you could see the hood bouncing my idle was way low thats why mine did it. If you have a optical tach check and make sure it is right.

kasey200 · 03-01-2011, 12:32 PM

okay i'll check it out. I'll i idle it up a bit What is a good idle speed? I think it's about 6-700 rpm right now.

ozone burner · 03-01-2011, 01:14 PM

it sould be a hair over 700rpm if i am right

MOPSD250 · 03-01-2011, 06:42 PM

Check your motor mounts. I just done two of them and I had to torch out some of the mounts.Im specifically talking the mount that bolts to the engine in the gusset is where I had to cut. It was hitting the topside of the mount that bolts to the frame.

kasey200 · 03-04-2011, 03:10 PM

Quote:

Originally Posted by MOPSD250

Check your motor mounts. I just done two of them and I had to torch out some of the mounts.Im specifically talking the mount that bolts to the engine in the gusset is where I had to cut. It was hitting the topside of the mount that bolts to the frame.

Well i crawled under it today and they are indeed touching! I'm sure this is the problem. did you torch them while in the truck or did you do it before the motor was in? Looks kinda tight to get a torch in here but i'll try it.

MOPSD250 · 03-07-2011, 07:54 PM

I torched them while it was in the truck. I didnt realize it either till I bent down one day cuz I dropped my can of dip. I just happened to look up and thought WTF!!!! And yes it is tight but can be done just have someone there with water the rubber will get a lil warm and ignite. I hope this helps you out

03-01-2011, 08:25 AM	#1
kasey200 Name: kasey200 Title: Too Much Time Status: Not Here Join Date: Sep 2006 Location: Rapid City, SD Member`s Gallery Posts: 877	rattle! Just finished up my 12v swap into an 03 excursion and i have a question for those of you that have done a similar swap. This thing has a harmonic vibration that rattles the interior of the truck like crazy when it's at certain RPM's at or near idle. Once you start ot accellerate (above 1000 rpm or so) the vibration goes away. It's not a slight vibration......... you can actually see the entire dash panel vibrate. FYI, I used fordcummins motormounts. Anybody else experience this??? __________________ 2003 Twin Turbo 5.9 Excursion

03-01-2011, 12:32 PM	#3
kasey200 Name: kasey200 Title: Too Much Time Status: Not Here Join Date: Sep 2006 Location: Rapid City, SD Member`s Gallery Posts: 877	okay i'll check it out. I'll i idle it up a bit What is a good idle speed? I think it's about 6-700 rpm right now. __________________ 2003 Twin Turbo 5.9 Excursion

03-01-2011, 06:42 PM	#5
MOPSD250 Name: MOPSD250 Title: Diesel Enthusiast Status: Not Here Join Date: Aug 2009 Member`s Gallery Posts: 166	Check your motor mounts. I just done two of them and I had to torch out some of the mounts.Im specifically talking the mount that bolts to the engine in the gusset is where I had to cut. It was hitting the topside of the mount that bolts to the frame. __________________ 2003 Ford Super Duty SC 8' BED Its here and DONE!! 2001 24V P-pump.160HP pump 20*100 plate,4GSK, 022 DV's, DDP 150 Injectors,Industrial Injection Street Cam, 110lb Valve Springs,Fire Ringed Head,.093 Mild Steel Lines, .093 Tubes, Airdog 150 and a Raptor Fuel Pump

03-07-2011, 07:54 PM	#7
MOPSD250 Name: MOPSD250 Title: Diesel Enthusiast Status: Not Here Join Date: Aug 2009 Member`s Gallery Posts: 166	I torched them while it was in the truck. I didnt realize it either till I bent down one day cuz I dropped my can of dip. I just happened to look up and thought WTF!!!! And yes it is tight but can be done just have someone there with water the rubber will get a lil warm and ignite. I hope this helps you out __________________ 2003 Ford Super Duty SC 8' BED Its here and DONE!! 2001 24V P-pump.160HP pump 20*100 plate,4GSK, 022 DV's, DDP 150 Injectors,Industrial Injection Street Cam, 110lb Valve Springs,Fire Ringed Head,.093 Mild Steel Lines, .093 Tubes, Airdog 150 and a Raptor Fuel Pump

03-01-2011, 09:54 AM	#2
ozone burner Name: ozone burner Title: Too Much Time Status: Not Here Join Date: Mar 2009 Location: Ne ohio Member`s Gallery Posts: 336	mine did that you could see the hood bouncing my idle was way low thats why mine did it. If you have a optical tach check and make sure it is right.

03-01-2011, 01:14 PM	#4
ozone burner Name: ozone burner Title: Too Much Time Status: Not Here Join Date: Mar 2009 Location: Ne ohio Member`s Gallery Posts: 336	it sould be a hair over 700rpm if i am right