d17 LPG overhaul
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=170004
Printed Date: 25 Sep 2024 at 10:21am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: d17 LPG overhaul
Posted By: AllisD17AndyOk
Subject: d17 LPG overhaul
Date Posted: 10 Apr 2020 at 11:44am
Hello, been lurking here for a year, now onsite...brought a '69 D17 last year
that was parked in pasture for 20 years with a homemade car bullet muffler on it and needless to say, engine full of water. Been soaking pistons for a year, but still frozen. It is a factory LPG engine, and I do not want to buy an overhaul kit that loses compression below the factory 8.25 to 1 ratio. AGCO prices the original kit above $1600 dollars. Most other kits are from 5 to 700 dollars, but do not tell you the ratio. OKtractor lists a high compression kit for about $800 but when I called them they did not know the compression ratio or the psi per cylinder. I would like to achieve about 210 lbs psi since
is
|
Replies:
Posted By: AllisD17AndyOk
Date Posted: 10 Apr 2020 at 11:59am
|
Sorry, must have hit wrong button...I want to achieve 210 lbs psi because I remember my dad upgrading our old wd45 50 years ago and testing at 210 on all cylinders. It was a good farm tractor there on LPG, but wouldn't hardly run on gas. I'm hoping someone has experience with the high compression kits and can tell me what psi they achieved with them...Thanks, Andy
|
Posted By: DrAllis
Date Posted: 10 Apr 2020 at 12:08pm
|
180 psi is what the actual compression testing would show. 180 psi is AC service book spec. 210 psi is a gauge that reads high. Any more than 180 psi you will have detonation issues and there isn't any higher test LPG that I am aware of. The last series 4 D-17 was built in Spring of 1967. 1969 was the third year for the One-Seventy ( summer 67-68-69)
|
Posted By: AllisD17AndyOk
Date Posted: 10 Apr 2020 at 12:39pm
|
Sorry, Dr. Allis, I hit yet another wrong button, it is indeed a 59 model and I knew that. I seem to remember you speaking of a D19 that had factory LPG someone wanted you to change to gas and I think you said it was 210 psi and you never made it run correctly on gas. I remember (granted I'm getting older...) that the wd45 tested 210 lbs. and ran fine in the field on lpg but on gas you could only idle home to refill the lpg. I also remember the same compression gauge on our two wds showed 110 to 140 lbs. depending on wear. I really think it was accurate, but I also know you know your stuff way better than I ever will. Thanks
|
Posted By: Boss Man
Date Posted: 10 Apr 2020 at 12:49pm
|
Should run fine with stock compression. I remember an old timer telling me they would convert engines in the early 70's to LP by putting hardened seats in the head and plumbing the LP equipment.
|
Posted By: DrAllis
Date Posted: 10 Apr 2020 at 1:27pm
|
It will run OK, but will be short of some HP. A D-17 gas was 7.25 to 1 compression and an LPG was 8.25 to 1 compression. The Gasser was 53 HP while the LPG was 51 HP (from memory). Yes, the D-19 LPG was 9.35 to 1 compression ratio, so it probably was 210 psi spec cranking compression, so maybe the LPG fuel is OK with that . They never did the G-226 that high, maybe concerned about connecting rod strength ???
|
Posted By: AllisD17AndyOk
Date Posted: 10 Apr 2020 at 6:26pm
|
And the loss of horsepower is what concerns me as I read some of these previous threads, it appears that the kits I see are generic for wd, wd45, d17, and 170 tractors, and there are no lpg piston kit available except for Agco, which were $1600 dollars last year, I haven't checked this year to see if they are even available from them. I don't want to do a overhaul on a d17 and have less hp than a gas wd. That's what spurs my interest in the high compression piston kit.
|
Posted By: alchpuller
Date Posted: 11 Apr 2020 at 9:49am
Use a sleeve / piston kit for a 201 WC or WD ,should be good for L P , also works for E 85
|
Posted By: old farmer
Date Posted: 11 Apr 2020 at 10:01am
|
I got A and I 8.25 compression over bore pistons for my WD45. Pistons had numbers on the inside of for compression ratio. Also check out high altitude sets as they are generally about the same as lp sets
|
Posted By: Lester
Date Posted: 11 Apr 2020 at 10:50am
Use 175 gas pistons that are also 8.25 to 1.
|
|