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05-18-2021, 06:23 PM
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#1
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Member
Brand: Thor Motor Coach
Model: ACE 30.1
State: West Virginia
Posts: 93
THOR #21234
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Driving with one cylinder down
So long story short, finally getting answers to my engine problems that I posted about awhile back. First off, found out I had a cracked exhaust manifold. My mechanic replaced that this morning, but was still showing a misfire in cyl 4. Checked compression, almost none there. Some more inspection revealed what you see in the pic. At this point he is unsure what shape the valve is in, or the cylinder, and is suspecting it may be cheaper just to go with a rebuilt engine vs pulling the head, etc. He is going to do some research, and call me back. Bad thing is, no matter which way I go, he is booked until at least August for any big jobs.
My question is, how safe is it to drive with one cylinder down? We have a couple trips scheduled in June that are less than two hours away that I really hate to miss. I did ask him, and he said unofficially, he did not see much of a problem, but could not officially tell me it would be safe.
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If every porkchop were perfect, we wouldn't have hotdogs!
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05-18-2021, 06:38 PM
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#2
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Senior Member
Brand: Still Looking
State: Alabama
Posts: 292
THOR #22687
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Don't do it. You can make your problems much worse.
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05-18-2021, 06:53 PM
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#3
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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I agree... 
That thing will NOT heal itself, and will only get worse...
...until it leaves you by the roadside. 
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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05-18-2021, 06:56 PM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 29M
State: Texas
Posts: 2,718
THOR #11781
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I would not drive an engine with valve trouble that causes a lack of compression. Sure, you can unplug the injector and softly drive it to a mechanic, but that is as far as I would go.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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05-18-2021, 07:07 PM
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#5
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,356
THOR #7035
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So where's the rest of the parts? Did he leave them out?
If the valve drops you will be stuck by the side of the road waiting on a tow.
Are you feeling lucky?
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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05-18-2021, 07:12 PM
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#6
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Quote:
Originally Posted by 16ACE27
So where's the rest of the parts? Did he leave them out?
If the valve drops you will be stuck by the side of the road waiting on a tow.
Are you feeling lucky?
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__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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05-18-2021, 07:18 PM
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#7
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,356
THOR #7035
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Quote:
Originally Posted by Bob Denman
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I knew that was coming Bob, what a set up!
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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05-18-2021, 07:23 PM
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#8
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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05-18-2021, 07:27 PM
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#9
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Senior Member
Brand: Thor Motor Coach
State: Florida
Posts: 1,241
THOR #1249
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Looks like the rocker arm is missing.
Did the mech remove it? Was other stuff messed up? Maybe you can get some other mech to take a look at it and fix it that is not so busy. i.e. second opinion.
Others are correct, don't drive it more than you have to. In fact Ford has a free towing.
Forgot to mention that is a less than $10 part.
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Former owner of 2015 Thor Vegas 24.1 in Ocala
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05-18-2021, 07:29 PM
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#10
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Senior Member
Brand: Still Looking
State: Alabama
Posts: 292
THOR #22687
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I'd find a new mechanic. Sounds like he's trying to sell you a new engine.
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05-18-2021, 07:32 PM
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#11
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,356
THOR #7035
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Quote:
Originally Posted by mcr1010
Looks like the rocker arm is missing.
Attachment 30632
Did the mech remove it? Was other stuff messed up? Maybe you can get some other mech to take a look at it and fix it that is not so busy. i.e. second opinion.
Others are correct, don't drive it more than you have to. In fact Ford has a free towing.
Forgot to mention that is a less than $10 part. |
Not on a 2013 MH.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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05-18-2021, 07:43 PM
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#12
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Senior Member
Brand: Thor Motor Coach
State: Florida
Posts: 1,241
THOR #1249
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Quote:
Originally Posted by 16ACE27
Not on a 2013 MH.
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I just assumed it was a V10. 
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Former owner of 2015 Thor Vegas 24.1 in Ocala
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05-18-2021, 07:53 PM
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#13
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,356
THOR #7035
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Quote:
Originally Posted by mcr1010
I just assumed it was a V10. |
It is. V10s have been around a lot longer than that.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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05-18-2021, 08:03 PM
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#14
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Site Team
Brand: Entegra
Model: Accolade 37TS
State: South Dakota
Posts: 8,776
THOR #1469
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If you run it until it blows the rebuilt May cost more because the used core may be worthless and parts needed for the new engine may get damaged.
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05-18-2021, 08:35 PM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,884
THOR #6826
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He should be able to look at the valve head with a bore scope. If it looks ok it should be ok to put it back together.
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05-18-2021, 08:57 PM
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#16
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 29M
State: Texas
Posts: 2,718
THOR #11781
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Quote:
Originally Posted by Pete'sMH
He should be able to look at the valve head with a bore scope. If it looks ok it should be ok to put it back together.
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I also agree with this, if it's a broken rocker and no other damage.
__________________
Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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05-18-2021, 09:38 PM
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#17
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Quote:
Originally Posted by EA37TS
If you run it until it blows the rebuilt May cost more because the used core may be worthless and parts needed for the new engine may get damaged.
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Yup...
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05-18-2021, 09:41 PM
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#18
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Senior Member
Brand: Thor Motor Coach
Model: Palazzo 36.1
State: Tennessee
Posts: 440
THOR #11607
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Worked with Ford for 26 years and owned a Ford dealership. No way would I drive that. Too many things can happen and create even more, expensive issues.
__________________
Greg, Gina & Ginger the rescue dog
2014 Palazzo 36.1, Cummins ISB 6.7 300hp, Allison 2500
TOAD 2008 Jeep Rubicon 4x4, Blue Ox Avail tow bar, RVibrake 3
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05-18-2021, 09:43 PM
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#19
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Member
Brand: Thor Motor Coach
Model: ACE 30.1
State: West Virginia
Posts: 93
THOR #21234
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Thanks for the input guys. I am not sure about the rocker cover, but I believe he mentioned that it was damaged. I picked up the RV today, and with the new manifold, it runs like it always did, so I suspect this issue was here all along, I just did not notice it. I did talk to him a bit more, and he isn't sure on the new engine, and is going to see about repairing what is there.
I did not think about the valve dropping, that sounds like a bad time for sure.
__________________
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If every porkchop were perfect, we wouldn't have hotdogs!
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05-18-2021, 11:07 PM
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#20
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Senior Member
Brand: Thor Motor Coach
Model: Vegas 24.1
State: Florida
Posts: 892
THOR #5313
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Please keep us posted. Curious to outcome.
I am very familiar with GM stuff and build my own engines for drag car. Few weeks ago I broke a polylock on a 350 during burnout at 6500 RPM. Started running on 7 cylinders and made 3 passes with car slow. Found issue with compression tester, 60 PSI instead of 220. Intake valve not opening. Had to pull intake as lifter was shot out of bore. Put everytthing back and replaced one rocker stud and car normal again.
Broken rockers not unusual on early gen small blocks. Never seen valve train open on v10 ford. I hope everything works out well for you.
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