Notices
1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Connecting rod clearence?

Thread Tools
 
Search this Thread
 
Old Jan 7, 2023 | 10:41 PM
  #1  
rylee95's Avatar
rylee95
Thread Starter
|
5th Wheeling
Joined: Apr 2022
Posts: 38
Likes: 2
From: idaho
Connecting rod clearence?

Rebuilding 351w, putting the pistons and rods back in, connecting rods don't seem to fit back right and seem really close to each other. Takes a lot more effort than it should to turn the engine. Anyone have an idea? Thanks
 
Reply
Old Jan 8, 2023 | 09:28 PM
  #2  
wwhite's Avatar
wwhite
Logistics Pro
10 Year Member
Community Influencer
Loved
Community Favorite
Joined: Aug 2014
Posts: 3,558
Likes: 852
What is your measured clearance for the rod/crank bearings?
 
Reply
Old Jan 8, 2023 | 11:28 PM
  #3  
Prototypemech's Avatar
Prototypemech
Logistics Pro
Photoriffic
Shutterbug
Community Builder
Liked
Joined: Nov 2013
Posts: 3,928
Likes: 1,198
From: Mojave, Ca

This should help.
 
Reply
Old Jan 9, 2023 | 05:29 AM
  #4  
GNR22's Avatar
GNR22
Logistics Pro
10 Year Member
Liked
Loved
Community Favorite
Joined: Mar 2011
Posts: 4,197
Likes: 558
From: Central Wisconsin
The connecting rods are directional. There is a chamfer on one side that meets up with the radius on the crank journal. If you have these flip flopped, you're going to have a real bad time. Also, if you have the caps on incorrectly, or the caps all mixed up, you're going to have a bad time.
 
Reply
Old Jan 9, 2023 | 06:19 AM
  #5  
cleatus12r's Avatar
cleatus12r
Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
Easy to spot in the picture that the cap you're holding has the chamfer the wrong way. I suspect that the one that's bolted together is also on backwards.

Either you are installing the pistons/rods in incorrect holes or 180 degrees off or your machine shop that pressed the wrist pins into the pistons didn't pay attention to the correct rod/piston orientation.



 
Reply
Old Jan 11, 2023 | 06:39 PM
  #6  
rylee95's Avatar
rylee95
Thread Starter
|
5th Wheeling
Joined: Apr 2022
Posts: 38
Likes: 2
From: idaho
Originally Posted by cleatus12r
Easy to spot in the picture that the cap you're holding has the chamfer the wrong way. I suspect that the one that's bolted together is also on backwards.

Either you are installing the pistons/rods in incorrect holes or 180 degrees off or your machine shop that pressed the wrist pins into the pistons didn't pay attention to the correct rod/piston orientation.


yeah got that all fixed and chamfer the right way but some of them are giving me more resistance. How hard should it be to turn over? I'll check clearence as well
 
Reply
Old Jan 11, 2023 | 07:34 PM
  #7  
wwhite's Avatar
wwhite
Logistics Pro
10 Year Member
Community Influencer
Loved
Community Favorite
Joined: Aug 2014
Posts: 3,558
Likes: 852
Did you measure before you ordered new bearings?
According to your other post, the engine has been rebuilt previous.
Did you order bearings to match, or did you assume bearings would be under/over size?
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
juancho_uy
Ford Inline Six, 200, 250, 4.9L / 300
11
Nov 19, 2015 08:12 PM
AXracer
1948 - 1956 F1, F100 & Larger F-Series Trucks
17
Jul 6, 2013 09:45 PM
xjpilot
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
4
Jan 22, 2012 03:56 PM
siphor84
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
6
Jul 9, 2005 09:45 PM
76 F150 Ranger XLT
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
4
Sep 10, 2004 02:51 PM




All times are GMT -5. The time now is 04:58 PM.

story-0
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-1
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 10:59:05


VIEW MORE
story-2
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-3
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-4
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-5
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-6
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-7
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-8
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-9
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE