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#1
04-05-2017, 11:26 PM
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crossmember
I think question came up not long ago. The engine crossmember has sagged to the point that the oil pan is basically resting on the centerlink. I'm going to be getting another frame for it but for now I'm looking for a temporary fix so I can drive it to my class reunion in July. Any suggestions?
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1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear 85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book. 87 F350 6.9 4 speed dually A poor man has poor ways. |
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#2
04-05-2017, 11:59 PM
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Depending how old your rubber engine mounts are, swapping in a fresh pair can make a big difference. As the rubber ages and gets oil soaked, they really start to sag, which can cause the same problem you're describing.
I solved a similar issue on my '72 GT. The mounts were sagging so much the fan was actually rubbing the bottom of the shroud. Fresh mounts cured it, and gave some clearance back between the centerlink and pan. Cheap fix.  Hope that helps. 
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Eric Mitten '74 Bonneville 4dr Sedan (455/TH400/2.93 open) '72 LeMans GT (455/M-13/3.23 [8.5"] posi) '71 GTO Hardtop (400/TH400/3.07 12 bolt posi) ‘71 GTO Convertible (455HO/TH400/3.23 posi) '67 GTO Coupe (455/ST-10/2.93 posi) Deuteronomy 8:3 
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#3
04-06-2017, 04:48 PM
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My 72 Lemans has a similar issue. Soooo close. I wondered if shimming under the frame mounts would help, or maybe massaging the pan just a touch with a wood dowel. My engine mounts are new.
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"...ridge reamer and ring compressor? Do they have tools like that?" |
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#4
04-06-2017, 06:13 PM
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I still can't imagine how that big engine cross member could even sag at all. I seen bad engine mount and body mount rubber cause issues. How do you measure for a sagging engine cross member?
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1971 Pontiac GT-37 Car is a junk yard dog and maybe one day will be restored. 
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#5
04-14-2017, 03:27 PM
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Quote:
There was a measurement taken between the brackets that the upper control arm cross shaft bolts to, and several guys had posted their measurements and the ones with sagged frames were ~ 1-2" shorter than the cars without sagged frames. I also recall some discussion about frame shops that could put the car on a rack and pull the frame back so the sag was gone.
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Michael  1970 Oshawa built 1 option Judge. 24 year restoration/upgrade project finally finished! 1979 Trans Am - low-buck drag car project for when I retire |
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