V4 looper 2.0L or 1.8L

[Magnum1500]

Is there an easy way to tell if an OMC looper power head is 2.0L cf 1.8L?<br /><br />The motor in question is about 1992. I was told that a 2.0L block had been fitted recently.<br /><br />What would the differnce in Bore size be?<br /><br />Do they use the same crank and conrods?

 

[Dhadley]

Re: V4 looper 2.0L or 1.8L

The powerheads are identical except for the pistons, rings, heads and head gaskets.<br /><br />On each of the head gaskets there is a tab sticking up at the top. Is that tab straight across or is there a "U" shaped cut out in the tab?

 

[seahorse5]

Re: V4 looper 2.0L or 1.8L

the 2.0L block was introduced in 1988. The 2.0L also uses a "butterfly" shaped powerpack that covered the top aft of the block.<br /><br />The '86 and '87 1.8L blocks used a single rectangular power pack on the port aft top of the block. It measured about 5 X 3" X 1" thick.

 

[Magnum1500]

Re: V4 looper 2.0L or 1.8L

Head gaskets have a U-shaped cut out on the tab.<br /><br />What should the cyl bore diameter be for 2.0L vs 1.8L ?

 

[Dhadley]

Re: V4 looper 2.0L or 1.8L

You have a 2.0 liter block. The standard bore is 3.685".

 

[Magnum1500]

Re: V4 looper 2.0L or 1.8L

I have come across a cheap 2.0L block. It has 2 liners removed.<br /><br />Do OMC supply replacement liners, or do I have to get my local machine shop to make them up?<br /><br />Have you got part numbers for liners?

 

[Dhadley]

Re: V4 looper 2.0L or 1.8L

Your (marine) machine shop will stock them from either LA Sleeve Co or Advanced Sleeve Co.