Cap popped off Yanmar 2GM, how to replace?

[ridgy]

Further to my post yesterday about a water leak, the culprit turned out to be this grey cap that popped off the right hand side below the first injector. Seems to be just a case of tapping it back in but should I use some sort of glue or sealant?
I have some hylomar blue to hand if that would do it.
I didn't know this could happen, luckily it was on the hard. Would be a bitch at sea, have to remove the starter and air intake to get to it.

 

[Touching Cloth]

Looks like a core plug to me. I would get a new one and tap it in with a suitable drift.

 

[SvenH]

Check for rust where it was before.
I had one pop two seasons back after forgetting to winterize and a sudden freeze.
It had a lot of rust which looked horrendous but cleaned up nicely.
Fitted the old plug back with some loctite but do not know which one.

 

[ridgy]

Does anyone know where they can be bought? Having trouble locating one.

 

[PCUK]

Car motor factors.

 

[DownWest]

Might try parts4engines, they do some stuff for Yanmar. Personally, I would fit a fresh one, not reuse.

 

[wonkywinch]

Check for rust where it was before.
I had one pop two seasons back after forgetting to winterize and a sudden freeze.
It had a lot of rust which looked horrendous but cleaned up nicely.
Fitted the old plug back with some loctite but do not know which one.

I would use a new core plug and Hylotyte or similar. Loctite is thread locking compound, Hylotyte etc is for sealing gaskets etc.

Hylotyte® Red 100

It's usually a freeze that pops core plugs as my early experience with Ford Cortina engines taught me. Check your antifreeze mixture at the same time.

 

[DinghyMan]

Quick google gives: core plugs

 

[wonkywinch]

Better still, this thread links to the service manual which, on page 95, shows how to replace the core plugs. It suggests replacing as a pair if one has gone.

Yanmar 2GM20 Service Manual PDF

 

[SvenH]

I went to a car parts store and explained what i wanted to acomplish. They gave me a loctite that is NOT for threads but cylindrical applications.

 

[Refueler]

Does anyone know where they can be bought? Having trouble locating one.

eBay is full of Core Plugs ....

 

[Refueler]

Further to my post yesterday about a water leak, the culprit turned out to be this grey cap that popped off the right hand side below the first injector. Seems to be just a case of tapping it back in but should I use some sort of glue or sealant?
I have some hylomar blue to hand if that would do it.
I didn't know this could happen, luckily it was on the hard. Would be a bitch at sea, have to remove the starter and air intake to get to it.

This is EXACTLY what I posted about on your previous question thread .... 2GM Water hose

Clean up the hole ... DO NOT use this old plug again as it has had its circumference compressed by its being fitted before ...

Get a new plug .. eBay has plenty or take it to a motor factors and get same size new ... you will notice that a new one - the outer ring has a slight angle to it .. circumference is slightly greater at outer ring than inner ... this gives it the holding power when pressed in - it needs careful tapping in with a suitable large drift to keep it straight as it goes in ... Only press it in till its flush with outside level of hole.

It does not need any Hermetite or addition ...

 

[Refueler]

Better still, this thread links to the service manual which, on page 95, shows how to replace the core plugs. It suggests replacing as a pair if one has gone.

Yanmar 2GM20 Service Manual PDF

NEVER try to put back old plugs - even if the look good ... because they have been compressed from being fitted before ...

 

[Refueler]

Let me post this again :

NEVER use an old used core plug. The circumference has been compressed and does not have the 'friction' to hold in place ...

Use of Hermetite or locking compound is not good idea ... and as long as you clean the hole .. use a new core plug - 'glue' is totally unnecessary.

 

[ridgy]

Thanks all, thought it might be an engine specific part but got a new cap from a car shop for 50p, job done.

 

[Refueler]

Thanks all, thought it might be an engine specific part but got a new cap from a car shop for 50p, job done.

I bought a bagfull of eBay .... for my Perkins .... in 20yrs - I have replaced 2. My engine is raw water cooled - so more corrosive for the plugs.