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B230 Frost Plugs. Cupped or Dished?

smoothdurban

smoothdurban

I do my own stunts
Joined
Jan 4, 2013
Location
Kemble Ontario
I am rebuilding a B230FT and I am going to replace the 40 mm frost plugs.

I see there are two different styles. The dished type that appear to be copies of the original design. These are after market only and NLA from Volvo. Then there is the cupped type PN 3531239.

Anyone have experience with the cupped kind? Why were they changed?
 
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There are early and late B200 series blocks and that includes the B230FTs.

The early style used the dish type plugs and the later blocks get the cup type.

FYI, Volvo still sells the dish type, aka Welsh plugs and I have them in stock.

I also have the aftermarket plugs for $1.98 each.

The Volvo OE plugs are $4.20 each.

smoothdurban said:
The dished type that appear to be copies of the original design. These are after market only and NLA from Volvo.
Click to expand...
 
My 90 b230ft has the early style. Is the early style the dished or cupped? I don't like the way the two words are similar I can't differentiate between the two other then early or later style..
 
Here's what the '88-'90 740 parts catalog shows for freeze plugs.

968955-5 8 8 - - - ? Expansion plug .................... ? Expansionsplugg ..................(1542263),ALTER 1
3531239-6 8 8 - - - ?Gap plug ............................. ? Hattplugg .............................ALTER 2



1 ) For engines with main bearing diameter 55 mm. I F?r motorer med ramlagerdiameter 55 mm.
2) Applies to a few engines, model year 1988. I G?ller ett f?tal motorer av 1988 ?rs modell.
3) For engines with 63 mm diameter main bearings. I F?r motorer med ram lagerdiameter 6 3 mm.
Click to expand...

While it doesn't specifically say the cup type plug fits the 63 mm main bearing rear thrust blocks, it sure looks that way.

smoothdurban said:
Great info guys so are these interchangeable? Also which is ?better??

My block is from a 91 but was probably cast in 90.
Click to expand...

No they're not.

sbabbs said:
My 90 b230ft has the early style. Is the early style the dished or cupped? I don't like the way the two words are similar I can't differentiate between the two other then early or later style..
Click to expand...


Early dished, disc or Welch type.

fullsize_35326.jpg


Late cup type.

fullsize_14690.jpg
 
Look at your plugs welch plugs are like a flat disk, cup plugs are well a cup, and both can rust from the inside
 
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