Jump to content

JP3 smoke from cylinder heads, after putting in new pistons and rings


DannyD

Featured Posts

11 minutes ago, frangar said:

It’s really not a hard job though to grease the rocker shaft & top the oil up…for me it’s part of the joy of owning a vintage engine rather than a digger power plant 

Yes that's a good point! 😉

Link to comment
Share on other sites

1 hour ago, john.k said:

The grease and oil rocker shafts have different part nos......indicating the threads are likely different........also note ,the JP3 lists elbows for the greasers,so you can get at them 

The threads are the same, the difference is in the oil way machining on the later shafts. In practice it makes little difference.

Link to comment
Share on other sites

No not yet, I'm currently blaming the oil I used, normally I have the Golden Film Classic SAE30 but it was a bit hard to order this time so I used Castrol classic XL SAE 30.

Before I pull the engine apart for the thirty time I wanna change the oil first to the Golden Film. I could order it now but it will take till the first week of december to get here.

 

Link to comment
Share on other sites

1 hour ago, DannyD said:

No not yet, I'm currently blaming the oil I used, normally I have the Golden Film Classic SAE30 but it was a bit hard to order this time so I used Castrol classic XL SAE 30.

Before I pull the engine apart for the thirty time I wanna change the oil first to the Golden Film. I could order it now but it will take till the first week of december to get here.

 

I found one of the VW campervan specialists was the cheapest place for Morris Classic SAE30 bought online.

Link to comment
Share on other sites

1 hour ago, Tracy D'arth said:

I can't see what difference using another oil will make to oil fuming. Its not the oil that causes fumes.

 

My thoughts too, unless its oil leaking out onto something very hot.

 

The smoke drifting around in the videos is more likely to be crank-case gas or combustion (exhaust) gas leaking out of somewhere. 

 

 

Link to comment
Share on other sites

Spec says it meets Mil-L-2104B,which was the requirement back in the 60s,so it should be ok.......New rings in worn chrome bores take a very long time to wear in,so that may be the cause of fumes.....honing chrome with a normal hone has no effect. 

Edited by john.k
  • Greenie 1
Link to comment
Share on other sites

On 23/11/2021 at 13:43, DannyD said:

Do you have a picture of the conversion?

 

Oil feeds to the rocker shafts on a JP3 which  originally drove a searchlight generator. I was told it was originally supplied to the RAF, hence the RAF blue paint colour, to a military spec. As far as I know the oil feed is original.

20211126_113723.jpg.698e643b3f4d75b890bf63da7b0affaa.jpg20211126_113734.jpg.6fed7b2deb514c52e675095d886872ad.jpg

Link to comment
Share on other sites

On 26/11/2021 at 10:08, john.k said:

Not wise to use anything but a HD diesel oil in any diesel........or youll end up with stuck rings.....rather a lot of oil in a JP3 too,sort of motor Id be changing once a year ,if it needed it.

I believe that manual stipulates an oil change every 250 hours. That's what I do on mine anyway. If you have a dry sump engine that's 6 gallons per change, which is not cheap.

 

Link to comment
Share on other sites

1 hour ago, monkeyhanger said:

I believe that manual stipulates an oil change every 250 hours. That's what I do on mine anyway. If you have a dry sump engine that's 6 gallons per change, which is not cheap.

 

My manual says 450hrs…dry sump so 6+ gallons. That works out at one a year for us. 

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.