Need info on 251 engine

Michel D · #1 03-03-10, 01:28

Do you no were y sould get Cylinder repair sleeve for the 251 engine.
I have a Napa number 2268006 but they don't seem to have it anymore!

Bob Carriere · #2 04-03-10, 03:34

Bonjour Michel

Are you talking about engine cylinder sleeves....? is your engine block that badly damaged....?

I would start with Chrysler of Canada and ask for resleeving parts for a Chrysler Industrial engine.. or if they know who may stioll manufacture them... they were available at one time for most engines but in todays disposable society I think they would be hard to find as a stock item.... a good machine shop could turn the block to accept a hand made sleeve but the cost would be ridiculous......

It may be cheaper to find a replacement engine ........ guy on EBay sells totally rebuilt 251 for about $2300 US dollars......

In fact there are a couple of beat up Dodge radio trucks at a paint ball park near my place that still has the engine block in them.... he might want to sell them

Boob

Michel D · #3 04-03-10, 04:17

No i just need to no if y can have parts for them.

The only one that is damadge is in the M152
The guy was using it to push snow and sand!!!

Now i have a bad oil pressure it start cold at 40 psi and drops wen it
warms up!
But the thing is that the oil pressure is fluctuating

Wpns 421 · #4 04-03-10, 11:57

I had the engine in my M37 rebuilt in Hull at a small garage that rebuilds engines. I have all the pistons etc. If you need parts the best place to call is Vintage Power Wagons in the US they have absolutly everything for the Dodges. Yesterday I called them and ordered new spark plugs for the M47 and M43.
In my M series vehicle I use a special oil sold by Stinson Fuels, it is a 15W40 oil designed for older type trucks it is design for older type engines to compensate for higher RPMs while having the viscosity and durability of newer diesel engines. My salesman sold told me this, so I bought a couple cases and use them exclusively on the M37, M43 and especially the Iltis.
Michel j'ai beaucoup de pieces pour ton camion. appel moi si tu as besoin de quelque chose. 819 827 4361 Gilles

Michel D · #5 04-03-10, 15:29

Ok dose some one no what could make the oil pressure on my engine fluctuate 10 to 15 psi!
I no that my gage is ok.
it is not the oil filter.
The oil pressure starts at 45 psi cold and start fluctuating between 35-45 psi. and more the engine warms up the pressure goes down and down!

May be the oil strainer is taking some air!

Alex Blair (RIP) · #6 04-03-10, 16:27

Quote:

Originally Posted by Michel D

Ok dose some one no what could make the oil pressure on my engine fluctuate 10 to 15 psi!
I no that my gage is ok.
it is not the oil filter.
The oil pressure starts at 45 psi cold and start fluctuating between 35-45 psi. and more the engine warms up the pressure goes down and down!

May be the oil strainer is taking some air!

Micheal..This is normal for the oil pressure to drop back after warming up..
and it will go down after warming up and will fluctuate with changes in RPM..
My old flat heads would start out cold at 40-50 PSI and drop to zero pressure at an idle warm..If it bothers you..put a piece of tape over the gage ..so you can't see it ..Sounds normal to me..

Michel D · #7 04-03-10, 19:04

The problem is the 2 other engine that i have starts up at 45 psi and stays at 40 psi HOT!

Alex Blair (RIP) · #8 04-03-10, 20:16

Quote:

Originally Posted by Alex Blair

Micheal..This is normal for the oil pressure to drop back after warming up..
and it will go down after warming up and will fluctuate with changes in RPM..
My old flat heads would start out cold at 40-50 PSI and drop to zero pressure at an idle warm..If it bothers you..put a piece of tape over the gage ..so you can't see it ..Sounds normal to me..

Mike..
If you start at 45 PSI cold and you drop off 15 PSI..even 20-25 PSI..that would still be lots of oil pressure..hot..15-25 Psi HOT IS OK..YOUR OTHER TWO ENGINES MUST HAVE BEEN REBUILT AT SOME POINT..

You may want to change your oil over to straight 40 Weight..non detergent oil..That was the summer weight oil that it was designed to use..Multi grade detergent oils were not even invented when that engine was designed..
It wasn't until 1968 that Castrol came out with it's Castrol GTX 20-50Weight multi grade that multigrades came into play..
And then they cut back on the zinc and phosphorous as anti wear additives when the catalytic converters came in so there are a lot of changes in motor oils since the 251CI came into being..Go back to the oil that was designed to run in it and enjoy it..

That is if you drive it only in the summer..you could drive it when it was cold but may have to plug it in to warm the oil before starting..Even with 40 weight ,non detergent oil in it you will see some drop in pressure..
That would quiet your engine,not drop as far on the oil Gage and work OK ..But the engine may be getting a little tired and a new set on main bearings and a regrind on the crank ,if it needs it ..but I wouldn't worry about it and drive it like it was until you decide to rebuild it..
Enjoy it and don't worry about it..
BUT..if it still bothers you..change the oil guage..It is probably worn out and will flicker and vibrate and do all sorts of tricks..it would be my first step ,if it was mine..