Slant *        6        Forum
Home Home Home
The Place to Go for Slant Six Info!
Click here to help support the Slant Six Forum!
It is currently Sat Jan 11, 2025 9:43 am

All times are UTC-08:00




Post new topic  Reply to topic  [ 3 posts ] 
Author Message
PostPosted: Sun Oct 11, 2009 7:22 pm 
Offline
3 Deuce Weber
User avatar

Joined: Mon Jan 15, 2007 9:37 am
Posts: 67
Location: Hudson Valley of NY state
Car Model:
I've been reading some of the discussions and thought I'd post my dilemma. I have a 1 owner 78 dodge D100 that I've owned for 30 yrs. 149K miles-burned #6 piston. Engine was quiet and had great oil pressure up until taken apart. I bought a set of rings for 1 cylinder to measure the end gap at various depths within each cylinder-results are shown below. A piston was used to assure that the ring was placed as squarely in the bore of each cyl as possible. Measurements were taken from 3 different depths from the top of each cylinder:

Depth Cyl 1 Cyl2 Cyl 3 Cyl 4 Cyl 5 Cyl 6
.75" 0.026 0.022 0.021 0.019 0.020 0.026
2" 0.018 0.019 0.020 0.018 0.019 0.020
3.5" 0.017 0.017 0.017 0.017 0.019 0.020


(sorry that chart doesn't line up properly)


My question: No scores in cylinders-honed and cleaned up before taking measurements. I know I need to replace #6 piston-is this engine close enough that you'd rering it the way it is, or am I at the point where I need to bore it? I want to have the block hot tanked, and new cam bearings pushed in while its apart. Is this a ring, bearing, valve job, or do I spend the extra bucks to go .020 over and replace all 6 pistons? This isn't a daily driver-used mostly for cruise-ins and an occasional run to a hardware store. I welcome your input before I make the decision which way to go. Thanks-Mike

_________________
Good gun control is hitting your target repeatedly


Top
   
 Post subject:
PostPosted: Sun Oct 11, 2009 8:35 pm 
Offline
Turbo EFI

Joined: Sat Feb 19, 2005 9:57 am
Posts: 1818
Car Model:
need to mike the cylinders to see if within specs....then decide what to do

keep on roddin'


Top
   
 Post subject:
PostPosted: Mon Oct 12, 2009 12:14 pm 
Offline
Guru
User avatar

Joined: Mon Oct 14, 2002 4:32 pm
Posts: 4880
Location: Working in Silicon Valley, USA
Car Model:
A key to a long running engine are round & straight cylinder bores.
You will need to measure for taper and roundness... your ring gap check will not really show you this type of wear.

Can you "get away" with a ring & valve job, I would say yes.
Will this "R & V" rebuild last for 200,000 miles... no.
Will a quickie rebuild get the vehicle running on a budget, yes but how long do you want the engine to last before it needs to be reworked again?
DD


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 3 posts ] 

All times are UTC-08:00


Who is online

Users browsing this forum: Semrush [Bot] and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited