Recent Topics
Let's Talk Porsche 911
by john_pifer - 02/21/20 02:51 AM
CLEARANCE ALERT O'Reilly's Mobil Super Oil
by GMguy84 - 02/21/20 01:27 AM
No more poulan / weedeater at walmart.
by jakewells - 02/21/20 12:44 AM
1991 Land Cruiser FJ80
by CCI - 02/20/20 09:57 PM
Gas price spread
by Chris142 - 02/20/20 09:28 PM
Need an Ecoboost Oil
by kstanf150 - 02/20/20 08:47 PM
2007 sedona
by macdole99 - 02/20/20 08:29 PM
USB-C, USB 3.0, 3.1Gen1, 3.1Gen2 Confusion.
by SubLGT - 02/20/20 08:12 PM
Apple Air Pro 2 tablet, How to send a link by email
by JLawrence08648 - 02/20/20 07:56 PM
Needed A Truck
by MParr - 02/20/20 07:21 PM
Battery Charger/Desulfator
by DBMaster - 02/20/20 06:45 PM
STP 0W-16 found in NC Autozone
by mv6845 - 02/20/20 06:20 PM
Cats
by Anduril - 02/20/20 06:12 PM
Are Onan oil filters now Fleetguard?
by atikovi - 02/20/20 05:57 PM
Car overheating under different conditions.
by MichaelRS - 02/20/20 04:39 PM
2008 CR-V AT Question
by Gebo - 02/20/20 04:18 PM
2019 Sienna
by s2krunner - 02/20/20 04:01 PM
Newest Members
Grennx, coverage, Bubbabighatt, AAIRCraig, Jason454
70763 Registered Users
Who's Online Now
49 registered members (antone, 2002 Maxima SE, Bailes1992, bbhero, Amkeer, 6 invisible), 1,292 guests, and 16 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics301,732
Posts5,201,612
Members70,763
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
Page 1 of 2 1 2
'01 Ranger 4.0L Thermostat Housing Seal Leaking #5341216 02/04/20 07:27 PM
Joined: Jan 2004
Posts: 6,043
B
benjamming Offline OP
OP Offline
B
Joined: Jan 2004
Posts: 6,043
2001 Ford Ranger 4.0L SOHC with 150k miles
I replaced the thermostat & o-ring at 145k miles. It's been leaking since. Took it apart & saw that the upper thermostat housing was buggered up on the sealing surface. Installed a new Ford Motorcraft part (only $10 and made in Great Brittain!). Still leaks between the upper & lower thermostat housing. Took it back apart & the o-ring (Fel-Pro p/n 35617) doesn't fit tight around the thermostat, but I don't think it's supposed to as the housing does the sealing. Is that right? Also, o-ring looks a little flat but I torqued the 3 bolts to 89 in-lb per the factory service manual. Is there a trick that I'm missing? I've got another o-ring, but I wanted to check in to see if I'm not doing something correctly before installing & putting back together.

Thank you.

Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341224 02/04/20 07:37 PM
Joined: Aug 2010
Posts: 7,267
K
Kira Offline
Offline
K
Joined: Aug 2010
Posts: 7,267
I've read about the housing.
The PO of my Ranger had it replaced at a local garage and I have no details. I've never given the thing a long, hard look.
I did read about a metal one which is supposed to be the cat's meow.
Go here: simmonsautosportz.com Look up the SA9. I think you can call 'em about it.

Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341230 02/04/20 07:43 PM
Joined: Jun 2003
Posts: 20,271
C
Chris142 Offline
Offline
C
Joined: Jun 2003
Posts: 20,271
Replace the bottom housing. That's what goes bad. Rarely does the top.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341235 02/04/20 07:44 PM
Joined: Oct 2005
Posts: 4,709
K
Kruse Offline
Offline
K
Joined: Oct 2005
Posts: 4,709
The metal replacements SEEM to be a better replacement to the cheap plastic housings. They are available on ebay and RockAuto, at least, the last that I looked.
More expensive, but seem to be well worth it. If I ever have a thermostat leak, I'll use the metal replacement.

Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341245 02/04/20 07:50 PM
Joined: Jan 2004
Posts: 6,043
B
benjamming Offline OP
OP Offline
B
Joined: Jan 2004
Posts: 6,043
Yeah the top was gouged along the sealing surface. Maybe it was fine, but I don't see how it would've sealed.

The bottom doesn't look bad. What should I be looking for as the failure? I would like to know for sure before removing the intake and all the other stuff. This should've been a simple thermostat replacement. Argh!

$135 for the Simmons metal one. Another Ford plastic one is $45 from online Ford parts department.

Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341257 02/04/20 07:59 PM
Joined: Oct 2005
Posts: 4,709
K
Kruse Offline
Offline
K
Joined: Oct 2005
Posts: 4,709
Originally Posted by benjamming

$135 for the Simmons metal one. Another Ford plastic one is $45 from online Ford parts department.


There are cheaper alternatives to both the metal and the plastic replacements. The Ford plastic part will eventually leak just like the plastic aftermarket part will eventually leak.

Last edited by Kruse; 02/04/20 08:00 PM.
Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341264 02/04/20 08:04 PM
Joined: Jun 2003
Posts: 20,271
C
Chris142 Offline
Offline
C
Joined: Jun 2003
Posts: 20,271
This is the sohc engine?


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341267 02/04/20 08:06 PM
Joined: Jan 2004
Posts: 6,043
B
benjamming Offline OP
OP Offline
B
Joined: Jan 2004
Posts: 6,043
Yes SOHC.

I just can't see how the lower is leaking as the sealing surface looks fine. Does it flex & cracks appear when under pressure that aren't visible when opened up?

Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341281 02/04/20 08:22 PM
Joined: Jun 2005
Posts: 13,971
bdcardinal Offline
Offline
Joined: Jun 2005
Posts: 13,971
The whole thing leaks, you need to replace everything.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341293 02/04/20 08:37 PM
Joined: Jan 2004
Posts: 6,043
B
benjamming Offline OP
OP Offline
B
Joined: Jan 2004
Posts: 6,043
So, is 150k miles about normal replacement interval?

Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341296 02/04/20 08:44 PM
Joined: Apr 2006
Posts: 9,699
0
01rangerxl Offline
Offline
0
Joined: Apr 2006
Posts: 9,699
Yeah, I think whole housing replacement is the way to go. My friend recently tried replacing just the t-stat with the same result. Ended up buying a Gates complete housing replacement with a lifetime warranty.

When I worked in a shop that saw a lot of SOHC 4.0s, we only qouted the whole housing.

The better aftermarket metal ones like Simmons are one piece below the thermostat, eliminating a large potential leak point.


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 236K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 202K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 254K miles
Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341307 02/04/20 08:53 PM
Joined: Aug 2008
Posts: 50
G
GearJammer Offline
Offline
G
Joined: Aug 2008
Posts: 50
Do not get a Dorman lower housing whatever you do. Ask me how I know. This is one occasion where a genuine Ford part is worth every penny.

Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341327 02/04/20 09:14 PM
Joined: Jan 2004
Posts: 6,043
B
benjamming Offline OP
OP Offline
B
Joined: Jan 2004
Posts: 6,043
So, are the 2 sensors typically replaced at the same time?

Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341364 02/04/20 10:01 PM
Joined: Jun 2005
Posts: 13,971
bdcardinal Offline
Offline
Joined: Jun 2005
Posts: 13,971
Originally Posted by benjamming
So, are the 2 sensors typically replaced at the same time?


Ford does not sell the o-rings by themselves so we replace the sensors.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: '01 Ranger 4.0L Thermostat Housing Seal Leaking [Re: benjamming] #5341372 02/04/20 10:10 PM
Joined: Jan 2012
Posts: 391
N
nobb Offline
Offline
N
Joined: Jan 2012
Posts: 391
I'm not familiar with the 4.0, but on the 3.0 the housing is metal and there is no need to replace that. What I did notice is that the fiber gasket doesn't always seal perfectly even when you have everything cleaned up and torqued to spec. BUT over time (like a few months) the gasket expands and leak stops. Fel-Pro does make a top of the line gasket which has rubber ridges instead of the standard fiber gasket which should hold up much better. I think they should've designed the housing with more than the two bolts holding it which doesn't provide as strong/even of a clamping force.

Page 1 of 2 1 2
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™