Clutch help
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5th Wheeling
Joined: Mar 2013
Posts: 28
Likes: 7
From: S.Oregon
Clutch help
Just got a 87 i6 with a np435. I need to do the clutch/flywheel. I was mainly wondering what other items should be replaced while I'm in there? I'm assuming the rear main. Also, will I need new bolts or can I reuse the old ones?
Cargo Master
Joined: Jan 2004
Posts: 3,118
Likes: 149
From: South Dakota
Any time you tear into the clutch replace the clutch disc, pressure plate throwout bearing and probably the pilot bearing. You will need a special tool to remove the old pilot bearing and even then they can SOMETIMES be a real beast to remove. I had to use a cold chisel to remove the pilot bearing on my '88 with the 6 cylinder.
Beings you just got it you probably don't know much about the history of it. I assume your clutch must be slipping or rough? In which case you will need to replace or resurface the flywheel as you suggest.
If you have any leakage from the rear main seal you would need to replace it so the oil doesn't get on the clutch and make it slip. If no sign of leakage I personally wouldn't replace it. I have around 230k miles on my '88 and no sign of leakage and never replaced the seal. Your results may vary.
You have an external slave cylinder so don't worry about replacing it now unless it leaks.
Beings you just got it you probably don't know much about the history of it. I assume your clutch must be slipping or rough? In which case you will need to replace or resurface the flywheel as you suggest.
If you have any leakage from the rear main seal you would need to replace it so the oil doesn't get on the clutch and make it slip. If no sign of leakage I personally wouldn't replace it. I have around 230k miles on my '88 and no sign of leakage and never replaced the seal. Your results may vary.
You have an external slave cylinder so don't worry about replacing it now unless it leaks.
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5th Wheeling
Joined: Mar 2013
Posts: 28
Likes: 7
From: S.Oregon
The guy that I got it from said that there was a large cloud of smoke while driving. After which the clutch stayed down and and it would not go into gear.... well it does go into gear, but nothing engages. The master is also bone dry
Lead Driver
Joined: May 2011
Posts: 5,772
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The brake fluid probably shot out of the hydraulic system and onto the exhaust. You need to figure out where it came from so you can repair that...the hydraulics are bad in your system, not necessarily the clutch. Don't order a new clutch until you fix your hydraulics.
Removing pilot bearing/bushing? Easy....pack it with grease and remove it the Ole fashion way, hydraulically. Once packed with grease (behind and inside the bearing), take a wooden dowel, or a socket extension, that fits snug inside the bearing and beat the dowel with a hammer....the grease will push the bearing right out.
Removing pilot bearing/bushing? Easy....pack it with grease and remove it the Ole fashion way, hydraulically. Once packed with grease (behind and inside the bearing), take a wooden dowel, or a socket extension, that fits snug inside the bearing and beat the dowel with a hammer....the grease will push the bearing right out.
Cargo Master
Joined: Jan 2004
Posts: 3,118
Likes: 149
From: South Dakota
'89F2rd likely nailed the smoking. It's strange the truck won't move UNLESS the blown out slave cylinder is somehow holding the lever that goes through the clutch housing that operates the throwout bearing. Another possibility the throwout bearing froze up on the shaft it slides on, holding the pressure plate disengaged, that would really be a strange one.
First thing I would crawl under the truck to see if POSSIBLY the blown out slave cylinder is somehow pushing tight against the lever that goes through the clutch housing.
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5th Wheeling
Joined: Mar 2013
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From: S.Oregon
Ok, so I took the tunnel cover off and it appears to be a np435. Im wondering what the correct clutch kit would be for the truck? Its an 87 I6 with the np435 transmission. Most clutch kits that I look at do not specify the transmission, but I believe that the np might be sort of uncommon in this year. Anything helps guys!!!
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Joined: Dec 2003
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From: Foothills of NC
Ok, so I took the tunnel cover off and it appears to be a np435. Im wondering what the correct clutch kit would be for the truck? Its an 87 I6 with the np435 transmission. Most clutch kits that I look at do not specify the transmission, but I believe that the np might be sort of uncommon in this year. Anything helps guys!!!
You need to check your clutch linkage like has been stated before.
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