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How big of a job is it to swap out an exhaust Manifold

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Westerj

How big of a job is it to swap out an exhaust Manifold

Have a 1985 F350 with 460 engine. there is some evidence of crackng on the #1 cylinder exhaust manifold.

How big of a job is that swap out?

1986 f350 Ambulance convert
2WD
project phase
460 v8
Low miles

Westerj

Re: How big of a job is it to swap out an exhaust Manifold

Looks bad.

1986 f350 Ambulance convert
2WD
project phase
460 v8
Low miles

reamer

Re: How big of a job is it to swap out an exhaust Manifold

It could be very easy! had to remove the manifolds on a '73 bronco cause they were cracked too. Thought it would be an all-day fight, but I drove it around and got it hot, the when it cooled slightly in the garage, All the bolts came out! Not a broken one on either side.
Then there is the other situation where once 1 bolt snaps, now its a day-long (or longer) fight....

1986 F-150 Flareside 4x4, 351, 4-v, ZF5 speed. AC, Cruise, Tilt, Slider, Digital clock, Radio, Lariat seat, Pwr doors/locks

Gary Lewis

Re: How big of a job is it to swap out an exhaust Manifold

Administrator

In reply to this post by Westerj

What's the silvery stuff? Has someone already attempted to repair the manifold? Or is it something that just melted on it? Have you tried to remove the silvery stuff with a screwdriver or something sharp?

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

85lebaront2

Re: How big of a job is it to swap out an exhaust Manifold

Administrator

In reply to this post by Westerj

That could only be a bad gasket, but, getting the bolts out can be mission impossible. Getting it good and hot might do it as they will get red hot after a good run. Does your truck have the dual air pumps with the pipes to the manifolds?

One of the issues on the right side (cyls 1 - 4) is access to the bolts around the upper spring seats on a 2WD model. Removing the inner fender plastic liner helps as you can get a straight shot at several of the bolts.

Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413

mat in tn

Re: How big of a job is it to swap out an exhaust Manifold

someone definitely has attempted to quiet things with "repair putty". I'm sure the crack is bigger than what you can see. and yes, this is a good example of a job that "should" be fairly strait forward but could get messy quick if bolts start breaking. good advice to get it up to temp and then let cool just enough to work safely with gloves and break all bolts loose. after that have let it cool even till the next day if needed. removal is usually the lion's share of the job.

Westerj

Re: How big of a job is it to swap out an exhaust Manifold

In reply to this post by 85lebaront2

Any tips on removing the plastic liner? The cost of the manifold is priced in, but the frustration level is intimidating. That should help alot. Is an pneumatic impact the right tool? It's a low mileage motor (34K) but is from 1986 - lotta years. Do have a loaner acetylene tank set on premises. Could do that too. Thanks in advance.

1986 f350 Ambulance convert
2WD
project phase
460 v8
Low miles

85lebaront2

Re: How big of a job is it to swap out an exhaust Manifold

Administrator

That side is a bit of a pain due to the battery tray. There are a few very small hex head (7/32") screws along the wheel opening lip, two 10mm head ones up front under the battery tray that have to be taken out from the top, two more that may have 8mm heads diagonally from underneath in line with the inside panel on the fender and one at the back through a firewall tab under the HVAC case. One, maybe two vertically behind the wheel opening into the rocker panel area.

If you can find the illustrations Gary Lewis put on the site it will help with fastener locations. On them, penetrating oil is your friend.

Bill AKA "LOBO" Profile

Gary Lewis

Re: How big of a job is it to swap out an exhaust Manifold

Administrator

Is this it, Bill? Documentation/Fasteners & Illustratons/FENDERS AND APRONS

Gary, AKA "Gary fellow": Profile

85lebaront2

Re: How big of a job is it to swap out an exhaust Manifold

Administrator

Bingo, 3 cherries! Exactly the picture needed!

Bill AKA "LOBO" Profile

Gary Lewis

Re: How big of a job is it to swap out an exhaust Manifold

Administrator

Good. Now back to my spreadsheeting...

Gary, AKA "Gary fellow": Profile