1998 2.4 Camshafts in 1999 T5

[xApprchsNfnty]

I'll be lapping them all for sure. Those deposits can be wiped off fairly easily though, think they would have kept the valves from seating?

[bmdubya1198]

WOW that's nasty! Good news is it doesn't look like you have any bent valves, but like Rick said, it would be a good idea to check the valve stems for straightness.
If everything checks out though, a good lapping should be all you need, then of course all new valve stem seals. I think the leaking valve seals could definitely have caused a lot of the oil/carbon buildup, which I think could possibly have caused problems with them seating properly.

[RickHaleParker]

Hang on guys. Volvo went from hydraulic to solid lifters in 1999. If he has solid lifters everything would need to be rematched when a cam is changed. If he got the lifters shuffled that could cause interference.

[bmdubya1198]

Being a 1999, it likely still has hydraulic lifters. But that's a good point.

[xApprchsNfnty]

Yes, lifters are hydraulic. I did label them but I don't think it really matters which ones go where.

I'm reading up on cleaning pistons/valves/head. Last engine I rebuilt I sent the head to a machine shop but I don't want to do that this time and its pistons/valves weren't as bad as these. Any recommendations? Looks like chem-dip and scrubbing is what I see being done the most on other forums, but $30 a gallon? Ouch. As far as tools, I have a hand drill and an angle grinder, no bench grinder. I'd like to just soak and brush though if the chem-dip would work.

[bmdubya1198]

Chem dip should work, but you can also use the smaller can of B12 Chemtool, it's the same stuff (at least I'm pretty sure). I don't think a bench grinder will be necessary except for a wire wheel potentially. Once you clean them up in some solvent , just lap them in the head with lapping compound.

[RickHaleParker]

WD-40, Scotch Brite, Soft brushes, Rags, Rags and more Rags. The WD in WD-40 stands for Water Displacement. It will displace the water in the carbon build up and weaken it's mechanical strength.

[xApprchsNfnty]

Brass wire wheels were the business to clean the valves. Scraped the pistons with an old credit card and used the wire wheels too. They were super nasty and pretty heavy pitting underneath all that carbon, not exactly sure why. Valves lapped and I think they all look good. I'm on hold until I get my gaskets/seals next week.















Left seat lapped

[abscate]

Hang on guys. Volvo went from hydraulic to solid lifters in 1999. If he has solid lifters everything would need to be rematched when a cam is changed. If he got the lifters shuffled that could cause interference.

FromAUS SITE

RN engine: mechanical (solid) valve lifters introduced in 1999
While RN series engines generally have mechanical valve lifters, engines produced up to mid-1999 had hydraulic lifters like the N Series engines. AustralianCar.Reviews understands that mechanical lifters commenced from engine number 1817653 and that, for these updated engines:
The intake ports were approximately 20 per larger;
The coolant and oil passages were modified;
The base circle on the camshaft increased by 2 mm;
Valve stem diameter decreased from 7 mm to 6 mm; and,
Valve length and lift also changed.
The intake and exhaust valve diameters, however, were unchanged at 31 mm and 27 mm, respectively

[abscate]

Hang on guys. Volvo went from hydraulic to solid lifters in 1999. If he has solid lifters everything would need to be rematched when a cam is changed. If he got the lifters shuffled that could cause interference.

FromAUS SITE

RN engine: mechanical (solid) valve lifters introduced in 1999
While RN series engines generally have mechanical valve lifters, engines produced up to mid-1999 had hydraulic lifters like the N Series engines. AustralianCar.Reviews understands that mechanical lifters commenced from engine number 1817653 and that, for these updated engines:
The intake ports were approximately 20 per larger;
The coolant and oil passages were modified;
The base circle on the camshaft increased by 2 mm;
Valve stem diameter decreased from 7 mm to 6 mm; and,
Valve length and lift also changed.
The intake and exhaust valve diameters, however, were unchanged at 31 mm and 27 mm, respectively