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Old 06-29-2022, 08:10 AM   #1
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Cool 2000 Suncruiser (New) Workhorse Exhaust issue

Truck repair shop dropped a new Workhorse engine (Jasper) in my 2000 Itaska Suncruiser last fall. First trip in March 22 Exhaust gaskets started failing at about 1200 miles. Ended up getting very loud at 1500 miles and returned to be fixed/reattached. Engine ran better than ever.! Second trip all was fine then they started leaking (making noise) at about 700 miles. Had them replaced on the road. Third trip they started failing at 500 miles, not very noisy yet but getting there. Going in today to have Donut Gaskets direct from GM put in. None of this should be happening with a new engine/Gaskets/Bolts. Also nothing is loose (bolts) according to the mechanic, so it's the gaskets? Anyone else experience this?
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Old 06-29-2022, 08:26 AM   #2
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Make sure they use new springs on the bolts. The old ones have lost their temper with all the blowby. Springs should be fully compressed but no "crush" should be placed upon the new exhaust donuts. Good luck!
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Old 07-12-2022, 02:00 PM   #3
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I had to replace both manifold gaskets on mine
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Old 07-12-2022, 04:28 PM   #4
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You have been getting the cheap asbestos donuts. The OEM donuts are semi-metallic. It's a known issue. The truck repair shop should have known better.

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Old 07-13-2022, 06:54 AM   #5
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Thumbs up OEM Gaskets on the Workhorse

Thank you Richard.

The Service Manager had new gaskets shipped right from the manufacturer this (3rd) time. He also said he fixed an exhaust hanger and a bolt.

Of coarse something else had to go wrong too, and the parking brake light came on and won't shut off. The shop is trying to figure it out and I've sent them all the information from "oldusedbear" that was on this forum.

I was on the trip about 4 hours away when it lit up and I smelled a slight burn odor. Luckily there was another truck repair 5 miles away. They don't work on Motorhomes and were booked up but did take the time to look for me. They also disconnected the Parking brake so I could drive the 4 hours home without burning anything up. (My gear shift park was also then disabled so I had to either block the wheels when I stopped, or put down the jacks).

Thank you again!
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Old 07-13-2022, 07:20 AM   #6
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I know there's a service bulletin or maybe just a practice to cut/separate the dual flange on GM big block ex. manifold with die grinder to help allow some flex and better seal those two.
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exhaust, suncruiser, workhorse

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