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Old August 30th, 2007, 09:00 PM   #1
Drg racr
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Default Where Is This Knock Coming From?!

Got a 94 Explorer with the 4.0L that's been knocking for quite a while. I've narrowed the knocking down to the bottom of the block. I used a piece of rubber hose to listen, and it's really loud where the starter goes into the bellhousing. There's no shavings in the oil, so I don't think it's a bearing. I've driven the truck like this all summer, so if it's serious, it would have blown by now. I've put 10000 miles on the knock. People think the truck is a diesel by the sound.
Can a cracked flywheel cause it? I know on Chevy's it can. Any other ideas? It seems to center aound the driver's side at the bottom of the engine. It also spark knocks a lot when I get on it. I'm going to try to pull the motor next week unless I can fix it in the truck.
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Old August 30th, 2007, 09:11 PM   #2
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My engine had a bad knock...really really bad and when i drained the oil, the oil looked fine. Crack open the oil filter
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Old August 30th, 2007, 09:26 PM   #3
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broken flywheel, very common on 4.0L with autos pre 95
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Old August 30th, 2007, 11:52 PM   #4
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broken flywheel, very common on 4.0L with autos pre 95
Tis true, have seen more than a few with this issue
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Old August 31st, 2007, 09:33 AM   #5
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Is there a way to view the flywheel? I don't see an inspection cover on it. Will I be able to see the crack if it's there?
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Old August 31st, 2007, 10:23 AM   #6
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Is there a way to view the flywheel? I don't see an inspection cover on it. Will I be able to see the crack if it's there?
If you've got the a4LD, there is an "inspection cover" of sorts, but it goes all the way up to the top bellhousing bolts.....stupid design IMO.....

The only way to view the flywheel would be through removing the starter - you should be able to get a decent view of it that way
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Old September 10th, 2007, 12:36 PM   #7
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I'm pulling the motor this week. I have most of the stuff out of the way. But, I can't get to some of the belhousing bolts, or the TC bolts. Any ideas?
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Old September 10th, 2007, 03:43 PM   #8
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I'm pulling the motor this week. I have most of the stuff out of the way. But, I can't get to some of the belhousing bolts, or the TC bolts. Any ideas?
Bell housing bolts: you can get them all with a long (talking 24"+) extension and going in through back by where the T-Case is mounted. However, I like to get the top two by lying on the motor and using a stubby wrench.

TC bolts: After the trans is loose, like able to be pulled 1/2" away from the engine, I swear that bell housing cover can be taken out but its been a few years...you got to get the trans off the dowel pins so the cover can come off them as well. You can do this, or just get the TC bolts through the hole cut into the bell housing cover for the starter......
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Old September 11th, 2007, 10:46 PM   #9
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Thanks for the tips. I might as well look at the bottom of the motor while I have it out. I figure I'll replace the bearings and oil pump, gaskets and have the heads checked. It's got 132000 miles, so not much should be worn out yet.
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Old September 11th, 2007, 10:50 PM   #10
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I recommend that when you do the intake gasket you properly torque and loctite the bolts, and use a ford gasket with RTV in the corners where the heads/intake/deck meet. Also, replace the O-ring that is located on the dummy distributor shaft plug (where a dist. used to go before EFI).....

While it's out, there's a updated rear main sleeve from ford that will keep it from leaking as this was another common problem

This link has tons of info on stuff like that:
http://www.babcox.com/editorial/ar/ar40123.htm
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