Advice on an engine rebuild - Ranger-Forums - The Ultimate Ford Ranger Resource

General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

LinkBack Thread Tools Search this Thread
Old 12-17-2007
RF Veteran
Thread Starter
Join Date: May 2005
Location: College Station, TX
Posts: 5,782
Advice on an engine rebuild

This isn't for the Ranger though, it's for the Samurai. I figured I'd throw it up on here anyways because rebuild procedures are rebuild procedures, regardless of what motor it is.

So here's the deal. The samurai runs pretty well, but it smokes like a chimney and burns oil pretty well too. The spark plugs have oil on them also. The motor's got more than 130k on it (though I haven't a clue as to exactly how much... the speedo cable was ripped out on a rock by the previous owner). I think the piston rings are worn and it's getting blow-by into the cylinders, and the valves might need some work as well.

What would y'all recommend as far as rebuilding the motor? Right now, I'm thinking I might take the head to a machine shop and have them work on it. Anyone have any suggestions on what I should have them look for/do, and how much it might cost? I also think I will try to re-hone the cylinder walls and re-ring the pistons. While I've got the block apart, what should I look into replacing as far as bearings/seals go? Will I be able to get by with just doing rod and crank bearings, front and rear crank seals, and new gaskets? I'm on a bit of a budget and I know engine parts can get expensive really quickly.

I'm not looking for huge performance gains right now... I just want to get the motor back up and running well for as little as I can get away with (but it'd be nice if it lasted for awhile too!). Thanks for everyone's help!
Reply With Quote
Old 12-17-2007
Level I Supporter
Join Date: Aug 2006
Location: Durham, NC
Posts: 3,657
The first thing I would do is a compression, and leak down test to try and determine the health of the rings. Valve guides, and valve guide seals are
known to be a problem, and could be the source of oil consumption.

Blow-by leaves the cylinder going into the crankcase, instead of going into the cylinder.
Reply With Quote
Old 12-17-2007
wydopnthrtl's Avatar
iTrader: (2)
Join Date: Dec 2005
Location: SE, Mi
Posts: 2,342
You problem is more likely warped bores than wore out rings. That is to say.. the rings are worn.. but it's because of a non-round bore. Pull it apart and measure the roundness of the bore before spending a penny on it.

Otherwise.. honing the bores will "work" but you'll have piston slap. One way to help that is to use valvoline VR1 30w oil. It's thicker and has more zinc in it.

As far as the heads go. If you do them yourself check the valve to valve guide fit. If it's sloppy it'll eat through a new set of seal and you'll back in the oil buring business.

Reply With Quote
Old 12-17-2007
Fx4wannabe01's Avatar
RF Veteran
iTrader: (23)
Join Date: May 2005
Location: Boring, Oregon
Posts: 21,721
4.3L Chevy swap......??? hint hint, nudge, nudge.
Reply With Quote
Old 12-17-2007
RF Veteran
Thread Starter
Join Date: May 2005
Location: College Station, TX
Posts: 5,782
Haha I've got a '91 Chevy S10 with a GREAT running 4.3L, but the problem is that the rest of the truck is in good condition too (and, it's kinda my brother's for the time being).

Is there a special tool to measure the roundness of the cylinders? Or should I just try measuring the cylinder at the top, middle, and bottom and check for discrepancies?
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
87 Ranger engine rebuild 87xlt Project Logs 41 11-29-2014 01:10 AM
rebuild engine vs used engine schooney New Ideas 22 03-11-2011 06:15 PM
Where can I find rebuild/new engine? bmx4life SOHC - 2.3L & 2.5L Lima Engines 2 06-14-2010 07:57 PM
Nagging Engine Problems / Rebuild 94greenmachine Project Logs 8 08-25-2007 08:58 PM
Engine Rebuild, Or Swap? spec_ops57 General Ford Ranger Discussion 8 03-06-2006 03:51 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -6. The time now is 08:41 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.